P2152 — Fuel Injector Group “C” Supply Voltage Circuit/Open #

Note: The code label may vary depending on the manufacturer.
Known label variations for P2152 include:

• Fuel Injector Group C Voltage Supply Circuit Malfunction (Toyota)
• Fuel Injector Group “C” Circuit Open (Chrysler)
• Injector Circuit Group C – Voltage Supply/Open (GM/Chevrolet)
• Group C Fuel Injector Supply Voltage Circuit Open (Ford)

Summary of P2152 #

The P2152 diagnostic trouble code (DTC) indicates that the engine control module (ECM), sometimes called the powertrain control module (PCM), has detected an issue with the voltage supply circuit for Fuel Injector Group “C”. In simple terms, the ECM has noticed that the electrical path feeding a specific group of fuel injectors (typically in engines with grouped injector wiring) is either open or not supplying the correct voltage. This can result in poor engine performance, misfires, or even a no-start condition. The code is generally triggered by wiring problems, a faulty injector, or issues within the ECM itself. Prompt diagnosis is vital to prevent further engine damage or drivability issues.

Common Symptoms for Code P2152 #

When a P2152 code is stored, the vehicle may display several noticeable symptoms. Most are related to poor fuel delivery and engine misfires, as one or more injectors in group “C” may not be operating correctly. If left unresolved, these symptoms can escalate, potentially leading to catalytic converter damage or engine stalling. Typical symptoms include:

• Rough engine idle
• Engine misfires, especially under load or acceleration
• Reduced power or hesitation while driving
• Check Engine Light (CEL) illuminated
• Poor fuel economy
• Difficulty starting the engine
• Possible engine stalling

Most Likely Causes for Code P2152 #

The P2152 code is most often caused by problems within the electrical circuit that supplies voltage to Fuel Injector Group “C.” The “open” part of the code specifically points to a break or disconnect in the wiring or connections. Here are the most frequent causes, in order of likelihood:

1. Damaged or corroded wiring/connectors in the injector supply circuit
2. Faulty fuel injector(s) within Group “C”
3. Blown fuse or faulty relay supplying the injectors
4. ECM/PCM failure (rare but possible)
5. Poor ground connection for the injector circuit
6. Aftermarket modifications or incorrect repairs affecting wiring integrity

Step-by-Step Diagnostic Guide for P2152 #

Diagnosing P2152 requires a methodical approach, as electrical faults can be elusive. Always start with the basics before replacing expensive components. Follow these steps:

• Verify the code: Use a scan tool to confirm P2152 is active and note any related codes.
• Visual inspection: Examine the wiring harness and connectors for Fuel Injector Group “C” for signs of damage, corrosion, or disconnection.
• Check fuses and relays: Locate and test the fuse/relay that supplies the injector circuit for continuity and proper function.
• Test injector resistance: With the engine off, disconnect the injectors in Group “C” and measure resistance with a digital multimeter. Compare to OEM specifications.
• Backprobe supply voltage: With key ON, check for battery voltage at the supply wire to Group “C” injectors.
• Inspect ground: Ensure the injector ground circuit is intact and has low resistance.
• ECM testing: If all wiring and injectors test fine, check for ECM output signals. Substitute with a known-good ECM only as a last resort.

Possible Repairs for P2152 #

The correct repair for P2152 depends on the diagnosed root cause. Address the most common and accessible issues first. Here are typical repair actions:

• Repair or replace damaged wiring or connectors in the Group “C” injector circuit
• Replace faulty fuel injector(s) in Group “C”
• Replace blown fuse or faulty relay related to the injector supply
• Clean or restore poor ground connections
• Revert any improper aftermarket wiring or modifications
• Replace the ECM/PCM if all other causes are ruled out and OEM tests confirm failure

Is It Safe to Drive with Code P2152? #

Driving with a P2152 code is not recommended. Depending on how many injectors are affected, you may experience significant engine misfire, loss of power, or stalling, which could be dangerous in traffic. Continued driving can also lead to unburned fuel damaging the catalytic converter and increased emissions. If the engine runs poorly or stalls, have the vehicle towed and repaired before further use.

Vehicles Most Commonly Affected by Code P2152 #

While P2152 can theoretically appear on any OBD-II compliant vehicle with group-wired injectors, it is more frequently reported on vehicles with multi-bank or V-engine designs. Brands and models more commonly affected include:

• Chevrolet Silverado, Suburban, Tahoe (especially with V8 engines)
• Ford F-150, Expedition, Explorer
• Dodge Ram, Jeep Grand Cherokee (with V6/V8 engines)
• Toyota Tundra, Sequoia (multi-bank engines)
• GMC Sierra, Yukon

Common Mistakes & Best Practices with P2152 #

Diagnosing electrical codes like P2152 can be tricky and sometimes leads to unnecessary parts replacement. Here are some pitfalls to avoid and best practices to follow:

• Do not replace injectors without testing wiring first. Most P2152 codes are caused by wiring issues, not the injectors themselves.
• Don’t overlook fuses and relays. A simple blown fuse can trigger this code.
• Always use proper wiring repair techniques—avoid twisting wires together or poor-quality connectors.
• Check technical service bulletins (TSBs). Some manufacturers have known issues and fixes for this code.
• Clear the code and retest after any repair to confirm the issue is truly resolved.

Quick FAQ for P2152 #

Here are answers to a couple of the most common questions about P2152:

• Q: Can a bad fuel injector alone trigger P2152?
  A: It’s possible, but the majority of P2152 cases are caused by wiring or supply issues. Always check the whole circuit before replacing injectors.
• Q: Will resetting the code fix the problem?
  A: Clearing the code will turn off the warning light temporarily, but if the underlying issue isn’t repaired, the code will return.