P2667 — Fuel Shutoff Valve “B” Control Circuit High #

Note: The definition of this code may differ depending on the vehicle manufacturer (OEM).

• Fuel Shutoff Valve “B” Control Circuit High (Generic/OEMs)
• Fuel Cut-Off Solenoid “B” Circuit High (Ford, GM)
• Fuel Shutoff Control Circuit High – Bank B (Mercedes-Benz)
• Fuel Injection System Shutoff Valve “B” Circuit High (Volkswagen/Audi)

Summary for DTC P2667 #

P2667 is a diagnostic trouble code (DTC) that indicates the engine control module (ECM) has detected a high voltage condition in the control circuit of the fuel shutoff valve “B”. This valve is an electromechanical device responsible for regulating or stopping fuel flow to the engine, often for safety or emissions reasons. When the circuit voltage is higher than the manufacturer’s specified threshold, the ECM logs this code to warn of a possible malfunction. Although this code is most common on diesel engines, it can appear on some gasoline direct injection setups as well. Prompt attention is recommended, as ongoing issues may lead to engine performance problems or unexpected stalling.

Common Symptoms for Code P2667 #

When P2667 is set, symptoms may range from subtle to severe, depending on the severity of the circuit fault and vehicle design. Drivers or technicians should watch for the following:

• Check Engine Light illuminated (most frequent symptom)
• Hard starting or no start condition
• Engine stalling unexpectedly
• Reduced engine power or limp mode
• Rough idle or fluctuating RPMs
• Fuel economy drops

Most Probable Causes for DTC P2667 #

Diagnosing P2667 involves considering the most likely sources of a high voltage in the fuel shutoff valve “B” control circuit. The order below reflects the most frequent to less common causes:

1. Faulty fuel shutoff valve “B” (internal short or open circuit)
2. Damaged wiring harness (corroded, frayed, or shorted wires in the circuit)
3. Poor electrical connections at valve or ECM connectors
4. Malfunctioning ECM (rare, but possible if all else checks out)
5. Blown fuse or faulty relay (supplying power to the valve circuit)

Step-by-Step Diagnostic for Code P2667 #

To accurately pinpoint the cause of P2667, a systematic approach is crucial. The following step-by-step guide ensures thorough troubleshooting:

• Verify the code: Use an OBD-II scanner to confirm P2667 is present and note any accompanying codes.
• Inspect the wiring: Perform a visual check of the wires leading to the fuel shutoff valve “B” for signs of damage, corrosion, or loose connections.
• Test the valve: With a multimeter, measure the resistance of the fuel shutoff valve “B”. Compare your readings to OEM specifications.
• Check connectors: Unplug and inspect all related connectors for bent pins, moisture, or contamination.
• Check circuit voltage: With the ignition on, use a voltmeter to check for abnormal voltages (open circuit or short to voltage).
• Test ECM output: If all else is normal, check ECM control output as per manufacturer procedures.
• Clear the code and retest: After repairs, clear the code and road test the vehicle to ensure proper operation.

Possible Repairs for Code P2667 #

The specific repair for P2667 depends on the root cause identified during diagnosis. Here are the most common solutions linked to each cause:

• Replace the fuel shutoff valve “B” if it tests out of spec or is confirmed faulty.
• Repair or replace damaged wiring in the control circuit (including splicing or replacing harness sections as needed).
• Clean or repair electrical connectors, ensuring tight, corrosion-free contact.
• Replace the ECM only if all other causes are ruled out and the ECM is confirmed to be at fault (rare).
• Replace blown fuses or faulty relays supplying the circuit.

Can You Still Drive with Code P2667? #

Driving with code P2667 is not recommended. While some vehicles may continue to run, a faulty fuel shutoff valve can lead to unexpected stalling or prevent the engine from starting at all. In extreme cases, loss of fuel control could create safety hazards or cause the vehicle to enter limp mode. Immediate diagnosis and repair are advised to avoid being stranded or risking further damage.

Vehicles Commonly Affected by P2667 #

P2667 is most frequently found in diesel-powered vehicles and some gasoline direct injection engines, particularly those with advanced fuel management systems. Brands and models reporting this code most often include:

• Ford Super Duty (F-series with PowerStroke diesel)
• Chevrolet Silverado HD (Duramax diesel)
• Dodge Ram (Cummins diesel)
• Mercedes-Benz Sprinter (diesel)
• Volkswagen Touareg and Amarok (diesel)
• Some Audi TDI models

Common Mistakes & Best Practices for P2667 #

Even experienced technicians can overlook key steps when addressing P2667. Here are typical pitfalls and how to avoid them:

• Replacing the fuel shutoff valve without checking wiring/connectors — Always inspect the circuit first.
• Ignoring corrosion or moisture in connectors — This is a leading cause of high resistance/voltage issues.
• Clearing the code without performing a repair — The code will likely return, and underlying issues remain unresolved.
• Skipping technical service bulletins (TSBs) — Some OEMs issue updates or revised parts for this fault; always check for bulletins.

Quick FAQ for DTC P2667 #

Q: Will replacing the fuel shutoff valve “B” always fix P2667?
A: Not always. Wiring issues, connector problems, or even ECM faults can also trigger this code. Always diagnose before replacing parts.

Q: Can a simple blown fuse cause P2667?
A: Yes, if the fuse supplies power to the valve’s control circuit. Always check fuses as part of your diagnostic routine.