Error code

OBD2 P0700

OBD2P0700
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Transmission Control System (MIL Request).

Severity

moderateCan drive, but shifting issues or poor fuel economy may occur.

Summary

P0700 indicates a malfunction in the transmission control system, which is monitored by the ECM or TCM (Transmission Control Module). This code suggests there's an issue with communication between these modules and other vehicle systems.

Symptoms

  • Check Engine Light (CEL) illuminated
  • Poor fuel economy
  • Automatic transmission shifts improperly or harshly
  • Engine stalling when coming to a stop
  • Rough idle or poor acceleration

Common Causes

  • Electrical problems, such as wiring issues or corrosion
  • Upgraded oversized tires causing mismatch with factory settings
  • Worn automatic transmission components like solenoids and valves
  • Weak battery leading to low voltage conditions
  • Recent repairs that may require reprogramming of TCM
  • Low ATF (Automatic Transmission Fluid) levels

Diagnosis

  1. Check for related transmission-specific codes using a scan tool that can access the TCM.
  2. Inspect wiring and connectors for damage or corrosion.
  3. Verify ATF fluid level and condition.
  4. Test battery voltage to ensure it's within normal range (12.6 V minimum).
  5. Consider reprogramming if recent repairs were made.

Fixes

  • Repair wiring issues, replace faulty connectors or relays.
  • Reset the transmission control module (TCM) after addressing any electrical faults.

FAQ

What does P0700 mean?

P0700 indicates a malfunction in the transmission control system, which is monitored by the ECM or TCM. This code suggests there's an issue with communication between these modules and other vehicle systems.

How do I fix P0700?

Fixing P0700 involves diagnosing related transmission-specific codes, inspecting wiring for damage or corrosion, verifying ATF fluid level and condition, testing battery voltage, and considering reprogramming if recent repairs were made.

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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