P25D5

Code

Generic P — Powertrain

Exhaust Camshaft Actuator Park Lock Control Circuit High Bank 2

Brand: Generic

Type: P — Powertrain

Views: UK: 17 EN: 27 RU: 20

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Page language: EN

Causes

Short to battery or other high-voltage source on the park-lock control circuit
Failed or shorted exhaust camshaft actuator (park-lock solenoid/coils)
Corroded, damaged or loose connector or wiring (pin corrosion, broken wire, chafing)
Poor or broken ground for actuator or related circuits
Blown or failed fuse/relay feeding the actuator circuit
PCM/engine control module internal fault or damaged driver

Symptoms

Check Engine MIL illuminated and P25D5 stored
Reduced engine power or limp-home mode
Cam timing faults or rough idle
Difficulty starting or unusual valve timing behavior
Possible diagnostic trouble codes related to cam timing or position sensors

What to check

Read and record freeze frame and all related cam/timing codes with a capable scan tool
Inspect wiring harness and connector for the exhaust cam actuator (Bank 2) for damage, corrosion, oil contamination or loose pins
Backprobe actuator connector: measure reference/supply voltage, control signal, and ground with ignition ON and while commanding actuator with scan tool
Measure coil resistance of the park-lock solenoid with connector disconnected
Check fuses and relays powering cam actuator circuits
Wiggle test wiring while monitoring live data for intermittent changes

Signal parameters

Battery supply voltage to actuator: ~11–14.5 V with ignition ON
Park-lock control signal when inactive: near 0 V (0–1 V typical); when driven high: near battery voltage (~11–14 V)
Park-lock solenoid coil resistance (typical): often in the range 5–50 ohms depending on manufacturer — consult service data
PCM input/driver voltage expected to switch between low (~0 V) and battery voltage

Diagnostic algorithm

Verify code and capture freeze frame; check for related camshaft/cam position codes. Clear codes and attempt to re-run to confirm repeatability.
Visually inspect the Bank 2 exhaust camshaft actuator connector and wiring for damage, oil saturation, corrosion or pin movement. Repair any obvious damage.
With ignition ON (engine off), backprobe the actuator connector: verify battery supply, control/feedback voltage and ground presence. Compare to expected signal parameters.
Command the park-lock actuator ON and OFF with a scan tool while monitoring voltage and observing actuator behavior. Note any lack of movement or incorrect voltages.
Disconnect the actuator and measure coil resistance. If resistance is abnormally low (near short) or open, replace the actuator.
If voltage at the connector is high with the actuator disconnected, trace wiring for short to battery. Repair wiring or connector faults as found.
Check grounds and power feed fuses/relays. Repair poor grounds or replace failed fuses/relays.
If wiring and actuator test good, consider PCM driver fault. Verify with oscilloscope or substitute known-good PCM if available and following manufacturer procedures.
After repairs, clear codes and perform functional test and a road test to confirm the fault does not return.

Likely causes

Connector contamination or pin pushed out allowing high voltage feed
Damaged insulation causing wire contact with battery voltage harness
Failed actuator coil presenting low resistance to battery voltage
Intermittent open ground causing PCM driver to read high
Aftermarket repair or previous collision damage to wiring harness near valve cover

Fault status

⚠️ Status

Exhaust Camshaft Actuator Park Lock Control Circuit HIGH — Bank 2. Voltage above expected range on the park-lock control circuit for the exhaust cam actuator (Bank 2).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours