P1624
Symptom: CHECK ENGINE lamp (MIL) on. CHECK GEARBOX lamp on.
Transmission in limp-home mode.
CHECK ENGINE request
Fault symptoms
CHECK ENGINE lamp (MIL) on. CHECK GEARBOX lamp on.
Transmission in limp-home mode.
Conditions
The transmission control module (TCM) has recorded an emission-related
fault.
Diagnostic help
Diagnostic trouble code P1624 is generated when the transmission control module
(TCM) detects an emission-related fault. The TCM sends a CHECK ENGINE request to the
Motronic control module which then switches on the CHECK ENGINE lamp (MIL). See fault
diagnosis in the "Automatic transmission" service manual.
Check the wiring
Intermittent faults may occur as a result of temporary short circuits and breaks in the
wiring. Jiggle the wiring at several points and in different directions to ascertain whether the
wiring harness, including any connectors, is causing the trouble. Observe the multimeter,
ISAT scan tool or test lamp while doing this.
Diagnostic procedure
See fault diagnosis in Service Manual 4:2 "Automatic
transmission".
