Exhaust Gas Recirculation Throttle Control Circuit "A" Low
Code P2141 indicates the EGR throttle control valve circuit A is detecting a low voltage condition, suggesting an electrical short to ground or a wiring fault in the signal circuit. This prevents the engine computer from properly controlling exhaust gas recirculation flow, which can affect emissions control and engine performance.
What You Might Notice
- Check engine light illuminated
- Rough idle or unstable engine operation
- Reduced fuel economy
- Longer than normal diesel particulate filter regeneration times
- Possible loss of power or hesitation during acceleration
Most Common Causes
- 1
Wiring short to ground
The EGR throttle control circuit wiring may be damaged, pinched, or corroded, creating an unintended connection to ground that causes the low voltage signal.
- 2
EGR throttle control valve failure
The EGR throttle control valve itself may be internally shorted or mechanically failed, pulling the circuit signal voltage too low.
- 3
Connector or terminal corrosion
Corroded or loose connectors at the EGR throttle valve or PCM can create resistance issues that result in low voltage readings.
- 4
PCM module fault
In rare cases, a faulty powertrain control module (PCM) output driver may fail and pull the circuit low, though this is less common than wiring or valve issues.
How to Diagnose It
- 1
Check Wiring short to ground — The EGR throttle control circuit wiring may be damaged, pinched, or corroded, creating an unintended connection to ground that causes the low voltage signal.
- 2
Check EGR throttle control valve failure — The EGR throttle control valve itself may be internally shorted or mechanically failed, pulling the circuit signal voltage too low.
- 3
Check Connector or terminal corrosion — Corroded or loose connectors at the EGR throttle valve or PCM can create resistance issues that result in low voltage readings.
- 4
Check PCM module fault — In rare cases, a faulty powertrain control module (PCM) output driver may fail and pull the circuit low, though this is less common than wiring or valve issues.
How to Fix It
- 1
Inspect and repair wiring harness
Visually inspect the EGR throttle control circuit wiring from the PCM to the valve for damage, corrosion, or pinching. Repair or replace any damaged wiring and connectors.
- 2
Test and replace EGR throttle valve
Using a multimeter, test the EGR throttle control valve resistance and voltage. If faulty, replace the valve assembly with a new or remanufactured unit.
- 3
Clean or replace connectors
Remove and inspect connectors at both the EGR valve and PCM. Clean corrosion with electrical contact cleaner and dielectric grease, or replace corroded connectors.
- 4
Reprogram or replace PCM
If wiring and valve are confirmed good, have the PCM scanned and reprogrammed or replaced by a qualified technician to eliminate a faulty output driver.
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