Code : P1D20
Make : All makes
Description : P1D20 Multi Module Handshake Failure
Possible causes :
– Faulty Electronic Shifter Module (ESM) Internal Error
– Faulty Transmission Control Module (TCM) Internal Error
Solutions :
– Carry out a Reset via CarDiag
– Choose a better quality fuel
– Check that the tank cap is securely closed
– Check the oil level and add more if it is lower than MAX
– Restart an Automatic diagnostic via CarDiag
– If the fault persists, you can check the “Possible causes” listed above : visually inspect (by yourself (tutorials to come) or by a professional) the wiring harness and the associated connectors, check for damaged components, and look for broken, bent, pushed, or corroded connector pins.
