Error code

OBD2 P0870

OBD2P0870
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Transmission Fluid Pressure Sensor/Switch 'C' Circuit.

Severity

highNot recommended to drive as it poses a safety risk due to unexpected loss of power or shifting ability.

Summary

P0870 indicates a malfunction with the Transmission Fluid Pressure Sensor/Switch C circuit, which is crucial for monitoring transmission fluid pressure and ensuring smooth gear shifts.

Symptoms

  • Stored trouble code and possibly an illuminated warning light
  • Harsh or erratic gearshifts
  • Some gears may not engage
  • Transmission locked in limp mode

Common Causes

  • Defective Transmission Fluid Pressure Sensor
  • Damaged, shorted, burnt, disconnected, or corroded wiring and/or connectors
  • Dirty, degraded, or contaminated transmission fluid
  • Mechanical failures of the transmission or valve body
  • Failed or failing PCM/TCM

Diagnosis

  1. Check transmission fluid level and condition
  2. Inspect the Transmission Fluid Pressure Sensor for damage
  3. Test associated wiring for issues
  4. Perform resistance, continuity, ground integrity, and reference voltage tests on all associated wiring

Fixes

  • Replace defective Transmission Fluid Pressure Sensor or repair damaged wiring

FAQ

How serious is P0870?

P0870 should be considered serious as it can lead to catastrophic transmission failure if not addressed promptly.

Can I drive with P0870?

It's not recommended to drive the vehicle due to potential safety risks such as unexpected loss of power or shifting ability.

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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