P208C — Reductant Pump Control Circuit Low

What is the most common cause of P208C?

The most common causes are: control module driver fault, faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit.

What does OBD2 code P208C mean?

OBD2 code P208C flags a problem with the sensor and actuator circuits (reductant pump control circuit low). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit.

What are the symptoms of P208C?

Drivers most often notice: possible limp mode depending on the affected component, Check Engine Light on, the affected system operates intermittently or not at all, increased fuel consumption in some cases.

How much does it cost to fix P208C?

Replace the faulty sensor or actuator — $150–$500; Repair wiring or connectors — $80–$250; Control module repair — $300–$1,000. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

Will P208C clear itself?

Sometimes P208C clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What does P208C mean?

P208C (Reductant Pump Control Circuit Low) is stored when self-diagnostics detect abnormal readings or behaviour of the sensor and actuator circuits. It belongs to the powertrain (engine/transmission) category.

“Circuit low” means the voltage on the reductant pump control circuit stays below the expected minimum — close to ground. The usual physical reasons are a short to ground, a chafed wire touching metal, a missing supply voltage, or a failed component dragging the signal down.

This code does not appear from a single bad reading: the module must see the fault condition repeat under defined operating conditions before it turns on the warning light. The freeze frame captured with P208C — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.

What causes P208C?

• signal wire shorted to ground (chafed insulation)
• missing supply voltage to the reductant pump control
• failed reductant pump control pulling the signal low
• open or shorted wiring in the circuit
• poor ground connection
• corroded, loose or damaged connector
• blown fuse feeding the circuit

Common symptoms of P208C

• possible limp mode depending on the affected component
• Check Engine Light on
• the affected system operates intermittently or not at all
• increased fuel consumption in some cases

How to diagnose P208C

1. Connect an OBD2 scanner, confirm P208C is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
2. Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
3. Visually inspect the wiring harness and connectors related to the reductant pump control for damage, corrosion, chafing or poor contact.
4. Check for supply voltage at the reductant pump control connector first; then measure resistance from the signal wire to ground — near-zero ohms confirms a short to ground in the harness.
5. Measure reference voltage, ground and signal continuity at the component connector.
6. Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
7. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P208C does not return.

How to fix P208C

Start with the cheapest and most common causes before replacing expensive parts:

• Replace the faulty sensor or actuator — $150–$500
• Repair wiring or connectors — $80–$250
• Control module repair — $300–$1,000

How much does it cost to fix P208C?

Repair cost depends on which component actually failed. Typical scenarios for P208C (parts and labor, USD, independent shop rates):

• Replace the faulty sensor or actuator: $150–$500
• Repair wiring or connectors: $80–$250
• Control module repair: $300–$1,000

Overall, fixing P208C usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P208C?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

Related OBD2 codes

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• P2002: Diesel Particulate Filter Efficiency Below Threshold Bank 1
• P2003: Diesel Particulate Filter Efficiency Below Threshold Bank 2
• P2004: Intake Manifold Runner Control Stuck Open Bank 1
• P2005: Intake Manifold Runner Control Stuck Open Bank 2