DTC P0025 — “Camshaft Position B (Bank 2) Timing Over-Retarded”.

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✅ P0025 – Bank 2, Camshaft “B” (Exhaust Cam) Timing Over-Retarded

This code means:

The exhaust camshaft (B) on bank 2 is lagging behind the commanded position.

The ECM expected more timing advance, but the cam stayed retarded.

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🔧 COMMON CAUSES

Check these in order:

1️⃣ Low or Dirty Engine Oil

VVT needs clean oil pressure.

Sludge reduces oil flow to the cam phaser.

2️⃣ Faulty VVT Solenoid (OCV – Oil Control Valve) – Bank 2, Exhaust

Stuck or clogged solenoid

Electrical issue (open circuit, bad wiring)

3️⃣ Camshaft Phaser (Actuator) Stuck

Phaser unable to advance timing

Internal wear or sticking

4️⃣ Timing Chain / Belt Issues

Chain stretched

Incorrect timing after repair

Worn tensioner or guides

5️⃣ Oil Pressure Issues

Weak oil pump

Blocked oil passages

6️⃣ Cam or Crank Sensor Fault (Less Common)

Incorrect timing signal

Bad sensor wiring

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🧰 DIAGNOSIS STEPS (FOLLOW IN THIS ORDER)

Step 1: Check Engine Oil

Correct level?

Oil condition?
If dirty → change oil + filter (5W30/10W30 depending on vehicle).

Step 2: Inspect VVT Solenoid (Bank 2, “B”)

Unplug and check connector for oil contamination.

Apply 12V bench test → should click.

Remove and clean mesh filter (if present).

Replace if stuck or not actuating.

Step 3: Check Actual vs Commanded Cam Timing

Using a scan tool:

Check camshaft advance values.

If actual timing stays retarded → phaser problem or oil pressure issue.

Step 4: Inspect Timing Chain Alignment

Look for:

Chain slack

Worn tensioner

Mis-timed camshaft

Step 5: Check for Oil Pressure Problems

Use mechanical gauge.

Low pressure = internal engine or pump issue.

Step 6: Check Camshaft Position & Crank Sensors

Live data irregular?

Replace if faulty.

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🔧 Common Fixes (Based on Experience)

Most P0025 jobs end up being ONE of these:

Cause Approx Fix

Low/dirty oil Oil change
VVT solenoid clogged Cleaning or replacing OCV
Stuck cam phaser Replace phaser
Stretched timing chain Replace chain set
Wiring issue Repair harness

Welcome to madurai car service 💐🙏🏻.