Engine revs up at start and then back down and engine power reduced. displays codes p0325 and p1682. it has also done it will driving on the highway. scary there.
Ignition 1 Voltage (Powertrain Relay)
P0689, P1682, P2176
P0689, P1516, P1682, P2101
P0690
--
Ignition 1 Voltage (Run/Crank Relay)
B1370, B1380
P1682, B1370, B1380
P0575, P0650
One of these two ignition 1 voltage circuits has a problem
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance
The powertrain relay is the problem circuit
There are 2 ignition 1 voltage circuits supplied to the engine control module (ECM). The first ignition 1 voltage circuit is provided by the powertrain relay, through a fuse. This ignition 1 voltage circuit supplies power to all the internal ECM circuits associated with the throttle actuator control (TAC) operation.
Jeff Armer
Jeff Armer Jun 09, 2020 Edit Delete
powertrain relay powers fuse # 41 for ECM plus fuse 45 - battery voltage to injectors & ignition coil modules .
Jeff Armer
Jeff Armer Jun 09, 2020 Edit Delete
DTC P1682 is a Type B DTC.
Engine may operate in a reduced engine power mode.
Changing fuse 42 won't do anything , you have a problem with the TAC system throttle actuator control . Your vehichle has electronic throttle control - position sensors in the gas pedal an throttle body ,also has a DC motor which opens an closes to allow more air into the engine .
Jeff Armer
Jeff Armer Jun 09, 2020 Edit Delete
What year is your hhr ?
Jeff Armer
Jeff Armer Jun 09, 2020 Edit Delete
DTC P0325: Knock Sensor (KS) Circuit
DTC P1682: Ignition 1 Switch Circuit 2
Circuit/System Description
There are 2 ignition 1 voltage circuits supplied to the engine control module (ECM). The first ignition 1 voltage circuit is provided by the powertrain relay, through a fuse. This ignition 1 voltage circuit supplies power to all the internal ECM circuits associated with the throttle actuator control (TAC) operation. The run/crank relay provides the second ignition 1 voltage circuit to the ECM, through a fuse. This ignition 1 voltage provides power to other internal ECM circuits, except those associated with TAC operation. The ECM continuously monitors the voltage level difference between the two circuits.
Reduced Engine Power Mode
When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
• Acceleration limiting--The ECM will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.
• Limited throttle mode--The ECM will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
• Throttle default mode--The ECM will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The ECM will perform the following actions:
- Limit engine speed to idle by positioning the throttle position, or by controlling the fuel and spark if the throttle is turned OFF.
- Ignore the accelerator pedal input.
• Engine shutdown mode--The ECM will disable fuel and de-energize the throttle actuator.
Jeff Armer
Jeff Armer Jun 09, 2020 Edit Delete
Diagnostic Fault Information
Circuit
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance
Ignition 1 Voltage (Powertrain Relay)
P0689, P1682, P2176
P0689, P1516, P1682, P2101
P0690
--
Ignition 1 Voltage (Run/Crank Relay)
B1370, B1380
P1682, B1370, B1380
P0575, P0650
One of these two ignition 1 voltage circuits has a problem
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance
The powertrain relay is the problem circuit
There are 2 ignition 1 voltage circuits supplied to the engine control module (ECM). The first ignition 1 voltage circuit is provided by the powertrain relay, through a fuse. This ignition 1 voltage circuit supplies power to all the internal ECM circuits associated with the throttle actuator control (TAC) operation.
Jeff Armer
Jeff Armer Jun 09, 2020 Edit Delete
powertrain relay powers fuse # 41 for ECM plus fuse 45 - battery voltage to injectors & ignition coil modules .
Jeff Armer
Jeff Armer Jun 09, 2020 Edit Delete
DTC P1682 is a Type B DTC.
Engine may operate in a reduced engine power mode.
Jeff Armer×
×
This is known as limp mode.....it allows you to keep driving in order to get you to a garage...but it limits the revs to protect engine from further damage...the codes help garage diagnose what is going on...have you tried googling codes..?..it may point to a faulty or clogged up sensor...another simple cause can be the accelerator link if it's electric contacts..this happened on my ford maverick in winter..and all I did was press the lever hard several times with the engine if...and the limp mode vanished.
I have hhr 2006 and I have engine power reduced code
And buy too many things to fix .
And the problem persists
Solution : fuse 42
Are you saying changing fuse 42 will fix this issue?
Changing fuse 42 won't do anything , you have a problem with the TAC system throttle actuator control . Your vehichle has electronic throttle control - position sensors in the gas pedal an throttle body ,also has a DC motor which opens an closes to allow more air into the engine .
What year is your hhr ?
DTC P0325: Knock Sensor (KS) Circuit
DTC P1682: Ignition 1 Switch Circuit 2
Circuit/System Description
There are 2 ignition 1 voltage circuits supplied to the engine control module (ECM). The first ignition 1 voltage circuit is provided by the powertrain relay, through a fuse. This ignition 1 voltage circuit supplies power to all the internal ECM circuits associated with the throttle actuator control (TAC) operation. The run/crank relay provides the second ignition 1 voltage circuit to the ECM, through a fuse. This ignition 1 voltage provides power to other internal ECM circuits, except those associated with TAC operation. The ECM continuously monitors the voltage level difference between the two circuits.
Purpose
The throttle actuator control (TAC) system delivers improved throttle response and greater reliability and eliminates the need for mechanical cable. The TAC system performs the following functions:
• Accelerator pedal position (APP) sensing
• Throttle positioning to meet driver and engine demands
• Throttle position (TP) sensing
• Internal diagnostics
• Cruise control functions
• Manage TAC electrical power consumption
The TAC system includes the following components:
• The APP sensors
• The throttle body assembly
• The engine control module (ECM)
Reduced Engine Power Mode
When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
• Acceleration limiting--The ECM will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.
• Limited throttle mode--The ECM will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
• Throttle default mode--The ECM will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The ECM will perform the following actions:
- Limit engine speed to idle by positioning the throttle position, or by controlling the fuel and spark if the throttle is turned OFF.
- Ignore the accelerator pedal input.
• Engine shutdown mode--The ECM will disable fuel and de-energize the throttle actuator.
Diagnostic Fault Information
Circuit
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance
Ignition 1 Voltage (Powertrain Relay)
P0689, P1682, P2176
P0689, P1516, P1682, P2101
P0690
--
Ignition 1 Voltage (Run/Crank Relay)
B1370, B1380
P1682, B1370, B1380
P0575, P0650
One of these two ignition 1 voltage circuits has a problem
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance
The powertrain relay is the problem circuit
There are 2 ignition 1 voltage circuits supplied to the engine control module (ECM). The first ignition 1 voltage circuit is provided by the powertrain relay, through a fuse. This ignition 1 voltage circuit supplies power to all the internal ECM circuits associated with the throttle actuator control (TAC) operation.
powertrain relay powers fuse # 41 for ECM plus fuse 45 - battery voltage to injectors & ignition coil modules .
DTC P1682 is a Type B DTC.
Engine may operate in a reduced engine power mode.
DON’T IGNORE – REDUCED ENGINE POWER SOLVED: I am only writing this to save everyone else the problems I had. I have read 300+ posts and almost no one had the answer. Even now, I had trouble finding the exact solution even though I knew the answer. I have two HHRs, both had a Reduced Power Message displayed. Sometimes there was no code and other times it had different codes. Most posts indicate a problem with the Throttle Actuator Control (TAC), the TPS sensor, or TPS pedal switch, which doesn’t solve anything. The Reduced Power Message points to too many other components (which I checked numerous times) when really it has to do with the 5-volt reference wire (that feeds 6 other sensors) causing a misdiagnosis. The REAL PROBLEM lies in the pass-through connector for the fuel pump, located under the vehicle and in front of the left rear tire. I would have never imagined or found it without another mechanic’s help. One or more pins in the connector has some corrosion causing a bad/intermittent connection. Mine was caused by a leaking ice chest and/or a wet blanket behind the rear seat. The connector isn’t watertight on the inside of the vehicle, so the moisture enters from the backside. As soon as I unplugged it from under the vehicle, I found water inside it from months earlier. All I did was clean out both ends of the connector and it has been perfect for over a year. Since the issue is usually intermittent, making a bogus repair to anything may look like a fix, but it’s not. If you have a Reduced Power Message, please at least check out this link for more info and pics. Also, this repair is easy and costs nothing. Hopefully I don’t get in trouble for posting the same solution on several other posts, as it needs to be made known. https://sparkys-answers.com/2018/05/2008...
×
SOURCE: 04 chevy tahoe
the check engine light you are getting sounds like and electrical problem, have the battery and the alternator tested, and have autozone or the like pull the codes off for you and see if you can figure out what they are....
SOURCE: 2004 Chevy Tahoe - Reduced engine power message
have autzone check for any stored trouble codes, replace the fuel cap, make sure you have plenty of gas
SOURCE: chevy malibu displays engine power reduced
It's fuel related, check your fuel filter to see if it's clogged, let me know. Good luck, Jim
SOURCE: Chevy HHR 2008 LT 2.4. Message ESC OFF, SERVICE
Hello and welcome. the engine reduce power waraning is the key to the other problems. this is normally a problem with the electronic throttle system. the engine control module disables the traction control system when it detects a engine problem, in your case a problem with the electronic throttle system. you shouldnt drive with this concern. this is normally covered under the vehicles 100,000 mile warranty. you need to conteact your nearest dealer for help
SOURCE: engine won't start and shows trouble code P1516 and reduced engine power light is on
Here is the definition of the code.
Possible causes
- Faulty Throttle Actuator Control (TAC) module
- Throttle Actuator Control (TAC) module harness is open or shorted
- Throttle Actuator Control (TAC) module circuit poor electrical connection (loose or broken wires)
P1516 CHEVROLET Description
The Throttle Actuator Control (TAC) module contains data which is
essential for proper TAC operation. The TAC module continuously test the
integrity of this data. When the TAC module is unable to write or read
data to and from Random Access Memory (RAM), or the TAC module is unable
to correctly read data from the flash memory or and internal TAC module
processor fault is detected and the Detected Trouble Code (DTC) is set.
Read more: http://engine-codes.com/p1516_chevrolet.html#ixzz286Gl3cSo
5,828 views
Usually answered in minutes!
×