Error code

OBD2 P0737

OBD2P0737
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

TCM Engine Speed Output Circuit.

Severity

moderateCan drive, but shifting and fuel economy may be affected.

Summary

P0737 indicates that the TCM has received an incorrect or erratic signal from the engine speed output circuit, which is crucial for proper transmission shift patterns and engine drivability functions.

Symptoms

  • Malfunction Indicator Lamp (MIL) lights up
  • Harsh shifting or failure to shift
  • Decreased fuel economy
  • Speedometer fluctuation or malfunction
  • Engine stalling, misfiring, sagging, hesitation

Common Causes

  • Defective engine speed sensor (CKP)
  • Faulty transmission output speed sensor
  • Wiring issues or damaged connectors
  • Defective shift solenoids
  • Dirty or contaminated transmission fluid
  • Defective PCM (less common)

Diagnosis

  1. Check for open or short circuits in the wiring harness
  2. Inspect engine speed sensor (CKP) and transmission output speed sensor
  3. Verify proper operation of shift solenoids
  4. Examine transmission fluid condition

Fixes

  • Replace faulty sensors, repair damaged wiring or connectors

FAQ

What does P0737 mean?

P0737 indicates an issue with the engine speed output signal to the TCM, affecting transmission shift patterns and overall drivability.

How do I fix P0737?

Fixing P0737 typically involves replacing faulty sensors or repairing damaged wiring/connectors. Consult a professional mechanic for an accurate diagnosis.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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