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Home / DTC / P0878 — Transmission Fluid Pressure Sensor/Switch D Circuit High

P0878 — Transmission Fluid Pressure Sensor/Switch D Circuit High

Detailed page for trouble code P0878.

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Code

P0878

Generic P — Powertrain

Transmission Fluid Pressure Sensor/Switch D Circuit High

Brand: Generic
Type: P — Powertrain
Views: UK: 13 EN: 19 RU: 17
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Page language: EN

Causes

  • Faulty transmission fluid pressure sensor/switch D
  • Short to battery voltage or other power source on the sensor signal circuit
  • Poor or corroded connector or pin (open/poor contact)
  • Broken, chafed, or damaged wiring harness (intermittent short to voltage)
  • Poor sensor ground or reference voltage supply issue
  • Internal TCM/PCM fault (rare)

Symptoms

  • Check Engine Light / Transmission MIL illuminated
  • Transmission may go into limp/backup mode
  • Erratic or harsh shifting, delayed engagement
  • Transmission may stay in one gear or refuse to upshift
  • Stored P0878 (and possibly other transmission pressure codes)

What to check

  • Read and record freeze frame and all stored/ pending transmission-related codes
  • Visual inspection of sensor connector and wiring for corrosion, damage, or pins pushed out
  • Backprobe the sensor connector and check reference voltage, signal voltage, and ground with key on
  • Check continuity and shorts between signal and battery (+) and signal and ground with ignition off
  • Inspect transmission fluid level and condition (fluid contamination or extreme low level can cause pressure issues)
  • Wiggle test wiring while monitoring live data for intermittent changes

Signal parameters

  • Reference voltage (typical): ~5V reference from PCM/TCM (vehicle-specific)
  • Expected signal range (typical): ~0.5 V to ~4.5 V, rising with fluid pressure (varies by vehicle)
  • At key ON engine OFF: signal often near low end (~0.5–1.5 V) — exact values are vehicle-specific
  • Under load: signal may approach the higher end (~3–4.5 V) depending on gear and load
  • Exact voltages and units vary by manufacturer; always confirm with vehicle-specific data

Diagnostic algorithm

  1. Retrieve freeze-frame and all transmission/engine codes; note operating conditions when code set.
  2. Visually inspect the pressure sensor D connector and adjacent wiring for damage, corrosion, or pin push-out. Repair as needed.
  3. Backprobe the connector with key ON (engine OFF). Measure reference voltage, signal voltage, and ground. Compare to vehicle specifications.
  4. With ignition ON, check for a short to battery: measure voltage between signal circuit and battery positive. If near battery voltage with sensor connected, suspect short to power or failed sensor.
  5. With ignition OFF, check continuity between signal and battery positive and between signal and ground. Look for unintended low resistance (short).
  6. Perform wiggle test on harness while monitoring live data or signal voltage to reproduce intermittent issues.
  7. If wiring and connector check good, substitute a known-good sensor (if available) or replace the sensor and re-test.
  8. If new sensor and wiring repair do not clear the condition, check TCM/PCM reference and ground circuits; inspect for TCM-related faults and consult manufacturer data for TCM testing.
  9. After repairs, clear codes and perform a road test under the same conditions to verify the fault does not return.
  10. Safety note: Secure vehicle and follow safe lift/vehicle support practices when working under vehicle. Use proper electrical test equipment and vehicle-specific procedures.

Likely causes

  • Failed or electrically shorted pressure sensor/switch D
  • Connector corrosion or bent pin at sensor
  • Wire rubbed through and shorting to a 12V source
  • Poor ground or lost reference voltage to the sensor
  • Less likely: TCM/PCM internal fault

Fault status

⚠️ Status
Transmission Fluid Pressure Sensor/Switch D circuit voltage higher than allowed (Circuit High). May cause limp mode or altered shift behavior. Inspection and repair of sensor wiring or sensor recommended.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 to 3.0 hours

Similar codes

P0877 P0876 P0875 P0845 P0799
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