Error code

OBD2 P0701

OBD2P0701
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Transmission Control System Range/Performance.

Severity

moderateCan drive but fuel economy and drivability will suffer. Immediate diagnosis is recommended.

Summary

P0701 indicates a transmission control system range/performance issue, typically related to electrical problems or module failure in the TCM (Transmission Control Module).

Symptoms

  • Malfunction Indicator Light (MIL) illuminated
  • Poor fuel economy and drivability issues
  • Difficulty starting the vehicle
  • Misfiring behavior
  • Stalling when coming to a stop

Common Causes

  • Wiring harness or connector damage, corrosion
  • Aftermarket installations interfering with ECM/TCM communication

Diagnosis

  1. Check power and ground connections for both the ECM and TCM
  2. Inspect wiring harness between ECM and TCM for damage or corrosion
  3. Examine connectors at ECM and TCM for broken, bent pins, or water entry

Fixes

  • Replace damaged wiring harness or connector
  • Reflash or replace the TCM module if electrical issues are confirmed

FAQ

What does P0701 mean?

P0701 indicates a transmission control system range/performance issue, often due to wiring problems or TCM failure.

How do I fix P0701?

Fixes include repairing damaged wiring harness/connectors and replacing the TCM module if necessary.

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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