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Angela Bryant Posted on Sep 21, 2015
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What are the probable causes of DTCs C1226, C1222, C1221, C1233, C1232, C1291, P1106, and P1887?

The service engine light is on. I took it to auto zone for a reading

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Randy Ohler

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  • Pontiac Master 14,585 Answers
  • Posted on Jul 17, 2016
Randy Ohler
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Replace both front wheel bearings. Gets rid of the C codes. Have some one press the brake pedal, no brake lights, replace the brake switch at the brake pedal. This will most likely get rid of the TCC code. If not you'll have to replace the TCC solenoid. While in there also replace the EPC solenoid, boost valve, and the shift solenoids. These are common problems with the 4t40,45,60, and 65 transmissions.

Jeff Armer

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  • Pontiac Master 15,575 Answers
  • Posted on Sep 21, 2015
Jeff Armer
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DTC C1221 LF Wheel Speed Sensor Input Signal is 0
C1222 RF Wheel Speed Sensor Input Signal is 0
DTC C1226 RF Excessive Wheel Speed Variation
DTC C1232 LF Wheel Speed Circuit Open or Shorted
DTC C1233 RF Wheel Speed Circuit Open or Shorted
DTC C1291 Open Brake Lamp Switch Contacts During Deceleration
DTC C1291 detects an open brake switch. The EBCM looks for deceleration rates that may indicate braking action. The EBCM verifies braking action by repeating the method for finding deceleration rates that indicate braking action several times. In each case, the ABS will not be available because the EBCM does not see the brake switch input.
DTC P1106 Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage
DTC P1887 TCC Release Switch Circuit (3.4L)
DTC P1887 TCC Release Switch Circuit (2.4L)
The torque converter clutch (TCC) release switch is part of the automatic transmission fluid pressure (TFP) manual valve position switch. The TFP manual valve position switch is mounted to the transmission valve body. The TCC release switch is normally-closed.
The switch signals the PCM that the TCC is released. This is accomplished by torque converter release fluid pressure acting on the switch contact, thus opening the switch. When the voltage is high on the circuit, the PCM recognizes that the TCC is no longer engaged.
When the PCM determines that the TCC release switch is open (indicating that the TCC is not applied) and the TCC slip speed indicates that the TCC is applied, then DTC P1887 sets. DTC P1887 is a type B DTC.
You have all kind of problems , I suggest you take this to a qualified ASE certified repair shop that has the diagnostic tools to trouble shoot an repair the vehicle . Electrical testing is a must with open circuits an shorts ,plus hooking up a scan tool that reads sensor data .Not just a code reader like at the parts store . This video he has a Chrysler vehicle ,doesn't matter . Test is the same for all make an models !

How to test digital ABS wheel speed sensor

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Have a good tech. diagnose and estimate repair.
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I put another abs moule on my 2002 Cadillac and lights are still on how do I clear the lights

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From here, it looks like you have some bad connections or your DTC is in the process of dying.
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Have you replaced the wheel bearing on the right front? the sensor may well be bad, look first at the wiring however, as a bad connection will produce these codes. road salt, road debris, etc can lead to wiring damage. if no damage, I would have the sensor checked for a proper reading, if its out of range, then replace the wheel bearing (or sensor if its replaceable separately, you didn't give a year) if it checks out OK then move to the wiring to the ABS computer, then the computer itself.
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