What Does P208C Mean?
The DEF pump control circuit voltage is lower than expected. The PCM detects insufficient voltage or an open circuit condition in the pump control wiring.
Common Causes
30%
Open circuit or broken wire in pump control harness
25%
Corroded or loose connector at DEF pump
20%
Faulty DEF pump with internal short to ground
15%
Poor ground connection at pump or control module
10%
Failed DEF pump control module or PCM driver
Diagnostic Steps
1
Step 1: Inspect DEF pump connector for corrosion, bent pins, or moisture intrusion
2
Step 2: Measure voltage at pump connector control circuit with key on, engine off
3
Step 3: Check continuity of control circuit from pump back to control module
4
Step 4: Verify ground circuit integrity with resistance test to known good ground
5
Step 5: Perform voltage drop test on both power and ground circuits during pump activation
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The DEF pump control circuit voltage is lower than expected. The PCM detects insufficient voltage or an open circuit condition in the pump control wiring.
The most common cause of P208C (Reductant Pump Control Circuit Low) is: Open circuit or broken wire in pump control harness
Typical repair costs for P208C range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may enter reduced power mode after multiple drive cycles. DEF system will not function properly, affecting emissions compliance.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P208C to identify the root cause.
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Quick Info
Category
Powertrain
System
Selective Catalytic Reduction (SCR) Emissions System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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