Fault Family System: Powertrain (P-Codes) 24 SAE Codes

Cam Phaser Park Lock

Diagnostic & Technical Explanation

Code P25CA (Intake Camshaft Actuator Park Lock Control Circuit/Open Bank 1) concerns the locking pin mechanism that parks a camshaft phaser at its default position for shutdown and cold start, covering both the intake and exhaust actuator lock control circuits and the ECM's detection that a phaser is stuck locked, cannot achieve lock, or shows degraded lock-control performance. Low or degraded engine oil that starves the lock pin's release passage is the dominant cause, followed by varnish gumming the pin bore and a failed lock-control solenoid.

These 24 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 24 times.

Codes in this family (24)

Code	Definition	Repair coverage
P25CA	Intake Camshaft Actuator Park Lock Control Circuit/Open Bank 1	4 ranked fixes
P25CB	Intake Camshaft Actuator Park Lock Control Circuit Low Bank 1	4 ranked fixes
P25CC	Intake Camshaft Actuator Park Lock Control Circuit High Bank 1	4 ranked fixes
P25CD	Intake Camshaft Actuator Park Lock Control Circuit/Open Bank 2	4 ranked fixes
P25CE	Intake Camshaft Actuator Park Lock Control Circuit Low Bank 2	4 ranked fixes
P25CF	Intake Camshaft Actuator Park Lock Control Circuit High Bank 2	4 ranked fixes
P25D0	Exhaust Camshaft Actuator Park Lock Control Circuit/Open Bank 1	4 ranked fixes
P25D1	Exhaust Camshaft Actuator Park Lock Control Circuit Low Bank 1	4 ranked fixes
P25D2	Exhaust Camshaft Actuator Park Lock Control Circuit High Bank 1	4 ranked fixes
P25D3	Exhaust Camshaft Actuator Park Lock Control Circuit/Open Bank 2	4 ranked fixes
P25D4	Exhaust Camshaft Actuator Park Lock Control Circuit Low Bank 2	4 ranked fixes
P25D5	Exhaust Camshaft Actuator Park Lock Control Circuit High Bank 2	4 ranked fixes
P25DD	A Camshaft Position - Stuck In Locked Position Bank 1	4 ranked fixes
P25DE	A Camshaft Position - Unable to Achieve Locked Position Bank 1	4 ranked fixes
P25DF	A Camshaft Position Control Performance Bank 1	4 ranked fixes
P25E0	A Camshaft Position - Stuck In Locked Position Bank 2	4 ranked fixes
P25E1	A Camshaft Position - Unable to Achieve Locked Position Bank 2	4 ranked fixes
P25E2	A Camshaft Position Control Performance Bank 2	4 ranked fixes
P25E3	B Camshaft Position - Stuck In Locked Position Bank 1	4 ranked fixes
P25E4	B Camshaft Position - Unable to Achieve Locked Position Bank 1	4 ranked fixes
P25E5	B Camshaft Position Control Performance Bank 1	4 ranked fixes
P25E6	B Camshaft Position - Stuck In Locked Position Bank 2	4 ranked fixes
P25E7	B Camshaft Position - Unable to Achieve Locked Position Bank 2	4 ranked fixes
P25E8	B Camshaft Position Control Performance Bank 2	4 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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