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TCM E39 / P081B 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: The engine may not start.

  P081B 00


P/N Signal to ECM, Short to B+

Fault symptom

The engine may not start.

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Battery voltage must be between 9 - 18 V.
TCM not in Limp Home
Transmission is Not in P/N

Fault criteria:

Control module output short-circuit to B+.

Checking the wiring harness

Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.

Diagnostic help

Functions in the diagnostic tool related to the fault:

Test value:
Gear Selector Position
(See also description of readings/activations in diagnostic tool)