XJ XJ6 / XJ8 / XJR ( X350 & X358 ) 2003 - 2009

Brake Booster Solenoid codes

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Old May 3, 2021 | 07:55 PM
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From: Tuxedo, NY
Default Brake Booster Solenoid codes

In another thread I explained how my brake booster was causing lean operation. Changing the brake booster fixed that problem (long term fuel trims have dropped from 25 to less than 4) but now I have lost Dynamic Stability Control. Error codes are as follows:

C1285 - Booster Solenoid Output
C1287 - Booster pedal force switch circuit failure
B2736 - Pedal travel sensor failure

At first I thought it was the junkyard booster I installed so I removed it and installed a rebuilt unit from Rock auto, same codes.

So I must have damaged wiring or connected something wrong during the booster install. Does anyone else have experience with these codes?
 
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