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Home / DTC / P2154 — Fuel Injector Group C Supply Voltage Circuit High

P2154 — Fuel Injector Group C Supply Voltage Circuit High

Detailed page for trouble code P2154.

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Code

P2154

Generic P — Powertrain

Fuel Injector Group C Supply Voltage Circuit High

Brand: Generic
Type: P — Powertrain
Views: UK: 10 EN: 25 RU: 12
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Page language: EN

Causes

  • Short to battery voltage (B+) in group C injector harness
  • Faulty or corroded connector or pin (harness side or injector side)
  • Failed injector(s) with internal short
  • Faulty ECM/injector driver transistor (internal short to B+)
  • Blown or incorrect fuse, faulty power relay for EFI/injectors
  • Aftermarket wiring or modifications (bypasses, added relays)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Stored P2154 trouble code (may be accompanied by related injector codes)
  • Rough idle, misfire, or poor running under some conditions
  • Reduced engine performance or hesitation
  • Possible hard starting or extended crank
  • Intermittent drivability depending on wiring/connection condition

What to check

  • Read and record freeze-frame and all stored codes; note any related injector codes or misfire codes
  • Visual inspection of injector group C wiring, connectors, and harness for damage, corrosion, or rodent chewing
  • Verify battery voltage and charging system (with key ON engine OFF and engine running)
  • Check EFI/injector fuse(s) and relay(s) for proper operation
  • Measure voltage at injector group C supply with connector connected and disconnected (key ON engine OFF)
  • Backprobe injector driver pin at ECU (or harness pin) to check for unexpected B+ or pulsed signals

Signal parameters

  • Fuel injector supply rail (B+) expected: ~11–14 V with key ON/engine running
  • Low-side injector driver expected: switching (pulse) to ground during injection; idling pulses may be short duration
  • When injector group driver is inactive, ECU-side low-side should be near B+ (open/high) but not exceed battery voltage by more than a small margin
  • A 'circuit high' fault means measured voltage on the circuit is higher than the ECU's predefined threshold (compare readings to battery voltage)
  • Use an oscilloscope to verify pulse width modulation and confirm there is no steady unexpected high-voltage condition on the driver output

Diagnostic algorithm

  1. Retrieve all DTCs and freeze frame data. Note related injector or misfire codes.
  2. Perform visual inspection of harness/connectors for group C (securing, corrosion, damage). Repair obvious issues before further testing.
  3. Check EFI/injector fuses and relay; replace if faulty. Verify injector supply rail has battery voltage with key ON.
  4. With ignition ON (engine OFF) backprobe the injector supply and each injector low-side for group C. Compare to battery voltage. If supply is higher than battery or inconsistent, suspect backfeed or short to B+.
  5. Disconnect the injector group C connector(s). Re-test voltage at harness side and at the ECM connector. If voltage drops to expected values when disconnected, an injector or short in the harness is likely.
  6. Check continuity from harness pins to battery and to ECU ground. Look for short to B+ and short to ground using a multimeter (with power removed).
  7. Use a lab scope to view injector driver waveforms during cranking/running. Look for steady high voltage where switching pulses are expected or abnormal voltage spikes.
  8. Swap or isolate suspect injectors (if practical) to see if the fault follows an injector. If an injector is internally shorted, replacing it may clear the code.
  9. If wiring and injectors test OK, suspect ECU driver failure. Confirm with manufacturer-specific tests; replace ECM only after all wiring/injectors are ruled out.
  10. After repairs, clear codes and road test to verify the fault does not return.

Likely causes

  • Corroded or damaged connector at injector rail or ECU
  • Wire insulation chafed and contacting battery voltage
  • One or more injectors internally shorted to B+
  • ECM driver failure for injector group C
  • Faulty EFI/injector power relay or fuse allowing overvoltage

Fault status

⚠️ Status
Fuel Injector Group C supply voltage is higher than the expected range. ECM has logged P2154 and illuminated the MIL. Inspect wiring, connectors, injectors, fuse/relay, and ECM driver for the injector group.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0200 P0201 P0202 P0203 P0204 P2153
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