VECHILE DOES NOT REV UP FAULT P0652 WAS GIVEN BY A DIAGNOSTIC TEST. WHAT CAN I DO TO FIX THIS?

Limp mode. Have diagnostic test done for fault codes

Any fault codes on diagnostic machine? Is there a rattling noise on startup

its a common rail diesel so have you got a check engine light showing? if so the obd fault code is the clue if not what was the origional reason why you have changed the injectors? some common rail diesels need to have injection correction factors changed in to the engine control module by diagnostic equipment. if you renew or change them

Sensor Reference Voltage 'B' Circuit Low http://www.autocodes.com/p0652_hyundai.html

is it in safety limp mode?

need to plug it in with diagnostic machine
to see the fault

Where did you pull this code from ? What type scan tool did you use ,or was it a code reader ? Do you know about data communication networks on modern cars ? A U codes indicate a communication problem on the data network .
U1900 CAN Communication Bus Fault-Receive Error Audio Control Module REFER to Section 418-00 . U1900 CAN Communication Bus Fault-Receive Error ABS Module REFER to Section 418-00 . U1900 CAN Communication Bus Fault-Receive Error Instrument Cluster REFER to Section 418-00 . U1900 CAN Communication Bus Fault-Receive Error SJB REFER to Section 418-00 . The thing that would make this easier to diagnose would be to have a factory scan tool or a professional grade . Need to know what modules can communicate with scan tool .Honestly ,Don't think you can fix this . Dealer or ASE certified repair shop .Do you know what C.A.N. - controller area network is ? The vehicle has 3 module communications networks:

• high speed controller area network (CAN)
• medium speed CAN
• international standards organization (ISO) 9141 communications network

The diagnostic tool connects to the communications networks through the data link connector (DLC). The DLC allows a diagnostic tool access to diagnose and test the vehicle systems of any module on the communications networks.
All 3 communications networks are connected to the DLC. This makes diagnosis and testing of these systems easier by allowing one diagnostic tool to be able to diagnose and control any module on the 3 communications networks from one common connector. The DLC can be found under the instrument panel between the steering column and the driver door. Which module doesn't communicate with scan tool ?
Symptom Chart Condition Possible Sources Action

• The anti-lock brake system (ABS) module does not respond to the diagnostic tool

• Circuit or connection in the high speed controller area network (CAN)
• ABS module

• Go To Pinpoint Test A .

• The audio unit does not respond to the diagnostic tool

• Circuit or connection in the medium speed controller area network (CAN)
• Audio unit

• Go To Pinpoint Test B .

• Circuit or connection in the medium speed controller area network (CAN)
• Audio unit

• Go To Pinpoint Test B .

• The instrument cluster does not respond to the diagnostic tool - high speed controller area network (CAN)

• Circuit or connection in the high speed CAN
• Instrument cluster

• Go To Pinpoint Test C .

• The instrument cluster does not respond to the diagnostic tool - medium speed controller area network (CAN)

• Circuit or connection in the medium speed CAN
• Instrument cluster

• Go To Pinpoint Test D .

• The powertrain control module (PCM) does not respond to the diagnostic tool

• Circuit or connection in the high speed controller area network (CAN)
• PCM

• Go To Pinpoint Test E .

• The restraint control module (RCM) does not respond to the diagnostic tool

• Circuit or connection in the international standards organization (ISO) 9141 communications network
• RCM

• Go To Pinpoint Test I .

• The smart junction box (SJB) does not respond to the diagnostic tool

• Circuit or connection in the medium speed controller area network (CAN)
• SJB

• Go To Pinpoint Test F .

• No high speed controller area network (CAN) communication

• Circuit or connection in the high speed CAN
• High speed CAN modules

• Go To Pinpoint Test G .

• No medium speed controller area network (CAN) communication

• Circuit or connection in the medium speed CAN
• Medium speed CAN modules

• Go To Pinpoint Test H .

• No international standards organization (ISO) 9141 communications network communication

• Circuit or connection in the ISO 9141 communications network circuit
• Restraint control module (RCM)

• Go To Pinpoint Test I .

• No module/network communication - no power to the diagnostic tool

• Data link connector (DLC) C251
• Bussed electrical center (BEC) fuse 4 (30A)
• Smart junction box (SJB) fuse 8 (10A)
• Circuitry
• Diagnostic tool

• Go To Pinpoint Test J .

needs to be connected to diagnostic device. further info needed for diagnostic

The code you have is an OBD2 diagnostic code P0652 whcich is a System Voltage Low. In shirt the engine ECM is telling you the voltage it is recieving (battery voltage) is too low or below specs.
Possible causes are: - Loose or missing alternator drive belt
- Faulty alternator
- Battery defective
- Open or short system voltage circuit
I would start by checking the battery and belts and possibly alternator. The are required to keep battery voltage at 12 volts or higher.

there's a blend door actuator behind the dash. they are going bad all the times. however, check your coolant level first.

if the light stays on, this means the computer has detected a "hard" fault. This means that the fault is present and is detected during the computers power up self test. You need to follow the diagnostic procedures pertinent to the faults given. the light will stay on as long as the fault remains. Simply downloading the fault codes will not put the light out.