P2141 – Exhaust Gas Recirculation Throttle Control Circuit Low

P2141 is a powertrain Diagnostic Trouble Code (DTC) that points to an abnormal electrical condition the Powertrain Control Module (PCM) sees in a fuel injector control circuit signal. Under SAE J2012 structure, this is a circuit plausibility/power control type issue rather than a guaranteed bad injector or a specific cylinder on every vehicle. The exact circuit name and the hardware it monitors can vary by make, model, and year, so you confirm it with basic testing: verify power, ground, control-signal integrity, and whether the commanded injector event matches what the PCM “sees.”

What Does P2141 Mean?

SAE J2012 defines how DTCs are formatted, grouped, and described, and standardized DTC descriptions are published in the SAE J2012-DA digital annex. In practice, P2141 is commonly associated with a fuel injector control circuit signal plausibility problem (an electrical fault the PCM detects when expected voltage/current behavior doesn’t correlate with commanded injector operation).

This code is shown without a hyphen suffix, meaning no Failure Type Byte (FTB) is provided in the code display. If an FTB were present (for example, “-xx”), it would act as a subtype to narrow the failure mode (such as a particular signal behavior), but it would not change the base meaning of P2141. What makes P2141 distinct is that it’s about the PCM’s electrical monitoring of the injector control signal’s expected behavior versus reality, not a simple “replace this part” conclusion.

Quick Reference

• System: Powertrain (fuel injector control circuit monitoring)
• What it indicates: Injector control signal does not behave as expected compared to PCM command
• What varies by vehicle: Which injector circuit(s) are monitored and how the PCM measures current/voltage feedback
• Commonly involved: Injector harness/connectors, shared power feed, driver control wiring, PCM/ECM input monitoring
• Typical results: Rough running, misfire-like symptoms, reduced power, illuminated MIL
• Best first checks: Battery voltage stability, injector feed voltage, circuit voltage drop, harness rub-through, connector pin fit

Real-World Example / Field Notes

In the bay, P2141 often shows up after other work under the hood or after a no-start/rough-run episode where the harness has been tugged. One common pattern is an injector sub-harness that’s oil-soaked and brittle near the engine, creating intermittent contact at a connector or a rubbed-through section that only acts up with vibration. Another pattern is a shared injector power feed with excessive voltage drop from a weak relay contact or corroded splice, so the PCM commands injection but the monitored signal doesn’t match expectations. Less often, you’ll find an injector with abnormal internal resistance or an issue with the PCM’s injector-driver monitoring after the external wiring and loads test normal.

Symptoms of P2141

• Check Engine Light illuminated or intermittent, sometimes after a cold start or a bump in the road.
• Reduced Power limp-in behavior with limited throttle response to protect the engine when the signal looks implausible.
• Rough Running stumble, misfire-like feel, or uneven idle if the affected circuit is tied to air/fuel or actuator control.
• Hard Start extended cranking or delayed start when the control module can’t trust a critical input/output circuit.
• Poor Fuel Economy noticeable drop in mpg if the controller substitutes a default value for a questionable signal.
• Intermittent Stalling occasional stall at idle or during decel if the circuit drops out briefly.
• Transmission Drivability Change firmer shifts or altered shift timing if torque management is affected by the suspect signal.

Common Causes of P2141

Most Common Causes

• Harness or connector issue in a powertrain-related circuit: fretting, moisture intrusion, bent pins, partial terminal push-out, or poor pin fit that creates intermittent resistance.
• Power supply or ground integrity problem to a sensor/actuator or to the Engine Control Module (ECM)/Powertrain Control Module (PCM): voltage drop under load, loose ground fastener, corrosion at a splice.
• 5-volt reference or sensor return disturbance shared by multiple sensors: short-to-ground, short-to-voltage, or a chafed spot that intermittently pulls the reference off-spec.
• Signal plausibility failure due to out-of-range sensor output, noisy signal, or missing/invalid feedback from an actuator circuit (varies by make/model/year).
• Aftermarket wiring add-ons (remote start, alarm, audio, tuning devices) tapped into powertrain power/ground circuits causing noise or intermittent opens.

Less Common Causes

• Internal fault within a sensor/actuator (electrical, not mechanical) that only shows up when hot, vibrating, or under high current draw.
• Short between adjacent wires inside a loom, especially where the harness bends near the engine, battery tray, or transmission.
• Charging system over/under-voltage events that cause the controller to flag a plausibility issue during self-checks.
• Controller issue: possible internal processing or input-stage issue, considered only after all external wiring, powers, grounds, and signals test good.

Diagnosis: Step-by-Step Guide

Tools you’ll want: a scan tool with live data and freeze-frame, a Digital Multimeter (DMM), a test light, back-probing pins, wiring diagrams for your exact vehicle, a battery charger/maintainer, a fused jumper wire, and (if available) an oscilloscope for signal integrity checks.

1. Confirm the complaint and record freeze-frame data (engine speed, load, voltage). Clear the code and see if it returns immediately or only under certain conditions; this helps separate hard faults from intermittents.
2. Verify charging and battery health first. Measure battery voltage KOEO (Key On Engine Off) and running, and check for abnormal ripple if you have a scope. Low system voltage can create false plausibility faults.
3. Pull up the OEM wiring diagram for the circuit implicated by P2141 on your specific make/model/year. Because component-level meaning can vary, you must confirm which input/output and which module set the code before testing.
4. Do a focused visual inspection: harness routing, pinch points, abrasion near brackets, oil saturation, and connector water entry. Perform a wiggle test while watching live data for dropouts.
5. Check module and circuit powers/grounds with a voltage-drop test under load. Don’t rely on continuity alone; measure mV drop across grounds and feeds while the circuit is operating.
6. If a 5 V reference is involved, verify it at the sensor connector: reference-to-ground should be stable, and sensor return should be near 0 V drop to battery negative. Any sagging or bouncing points to a short or poor ground.
7. Check signal integrity. With the sensor/actuator connected, back-probe the signal and compare it to expected range and smoothness. Use a scope if available to catch glitches that a DMM averages out.
8. Isolate by unplugging one component at a time (only those on the same reference/signal network per diagram) to see if the reference/signal returns to normal. This helps identify a component or branch pulling the circuit off-spec.
9. Perform resistance checks only with the circuit de-powered: verify no short-to-ground/short-to-voltage and confirm end-to-end continuity. Flex the harness during testing to expose intermittent opens.
10. After repairs, clear codes and complete a road test duplicating the original conditions. Recheck live data and confirm monitors complete without the code returning.

Professional tip: When P2141 is intermittent, prioritize voltage-drop and oscilloscope checks during the exact conditions in freeze-frame (RPM, load, temperature); many “good” continuity tests pass on the bench but fail under vibration and current draw.

Possible Fixes & Repair Costs

Costs depend on what your tests prove. For P2141, you only replace parts after you’ve verified the circuit behavior (power, ground, reference, signal integrity, and plausibility) and confirmed the fault repeats under the same conditions.

• Low ($0–$120): Repair loose connector fit, clean/secure terminals, correct water intrusion, restore harness routing/strain relief. Justified when a wiggle test changes the signal, you find corrosion/fretting, or voltage drop improves after terminal service.
• Typical ($120–$450): Repair an open/high-resistance section of wiring, fix a shared sensor ground splice, or replace a commonly associated fuel-system actuator/sensor only if it fails a bench/scan plausibility check and its circuit tests good to the module. Use before/after measurements to confirm the repair.
• High ($450–$1,600+): Control module replacement or reconfiguration only after all external wiring, powers/grounds, references, and input/output signals test within spec and the fault can be duplicated. This points to a possible internal processing or input-stage issue, not a guaranteed module failure.

Labor swings widely with access, network complexity, and whether the failure is intermittent and heat/vibration related.

Can I Still Drive With P2141?

Sometimes you can, but you shouldn’t assume it’s safe. P2141 is a powertrain circuit plausibility-type fault, and on many vehicles it can affect fuel delivery strategy, power output, or emissions controls. If you notice reduced power, stalling, extended cranking, fuel smell, or surging, limit driving and avoid high load. If the engine runs rough or the vehicle hesitates merging, treat it as a tow/repair-now situation.

What Happens If You Ignore P2141?

Ignoring P2141 can turn an intermittent electrical issue into a no-start, repeated stalling, or a catalyst-damaging rich/lean condition, depending on how the vehicle fails safe. Heat, vibration, and moisture can worsen marginal connections, raising resistance and making the fault more frequent. You may also fail emissions testing, and extended driving with unstable fueling can accelerate wear on plugs, oxygen sensors, and the catalytic converter.

Last updated: February 13, 2026

Vehicles Commonly Affected by P2141

P2141 is commonly seen across modern vehicles with tightly integrated fuel and emissions controls, especially where multiple sensors/actuators share 5-volt references, sensor grounds, and high-current feeds. It’s often reported on some Volkswagen/Audi applications, certain Ford platforms, and various GM gasoline direct-injection vehicles, but the exact circuit tied to P2141 can differ. Higher under-hood heat, complex harness routing, and dense connector packaging make signal plausibility faults more likely.