What Does P008D Mean?
The ECM has detected a low voltage condition in the fuel cooler pump control circuit. This typically indicates a short to ground in the pump circuit wiring or an internally shorted pump motor. The fuel cooler pump may be running continuously or the circuit may be overloaded. Symptoms are typically subtle but may include elevated fuel temperature warnings under heavy load conditions.
Common Causes
35%
Short to ground in the wiring harness between the ECM and fuel cooler pump
30%
Internally shorted fuel cooler pump motor drawing excessive current
20%
Water intrusion or corrosion at the pump connector causing a low-resistance path to ground
15%
ECM output driver failure pulling the circuit low
Diagnostic Steps
1
Disconnect the fuel cooler pump and measure motor resistance. A very low reading (below 1 ohm) indicates an internally shorted motor that needs replacement.
2
With the pump disconnected, check continuity between the control wire and chassis ground. Continuity confirms a short to ground in the harness.
3
Inspect the pump connector and harness for water damage, corrosion, or chafed insulation. The pump location (often near the undercarriage) makes it susceptible to road debris and moisture.
4
Check the fuse for the fuel cooler pump circuit. A repeatedly blown fuse confirms excessive current draw from a short circuit.
5
If wiring and pump test normal, back-probe the ECM connector to verify the driver output is functioning correctly.
Estimated Repair Cost
$150 - $550
Parts + labor, varies by vehicle and location
The ECM has detected a low voltage condition in the fuel cooler pump control circuit. This typically indicates a short to ground in the pump circuit wiring or an internally shorted pump motor. The fuel cooler pump may be running continuously or the circuit may be overloaded. Symptoms are typically s...
The most common cause of P008D (Fuel Cooler Pump Control Circuit Low) is: Short to ground in the wiring harness between the ECM and fuel cooler pump
Typical repair costs for P008D range from $150 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive under normal conditions. The risk is primarily elevated fuel temperatures during sustained heavy load. If the short is drawing excessive current, it could potentially blow the fuse and disable the cooling circuit entirely. Monitor fuel temperature if the gauge is available.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P008D to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System
Difficulty
Type
Generic (SAE)
Recommended Tools
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