OBD-II trouble code
P2141: Exhaust Gas Recirculation Throttle Control Circuit 'A' Low
The word EGR in this title sends people to the wrong end of the engine. The part being commanded is a motorised butterfly in the intake tract, not a valve in the exhaust — and because its driver folds when the motor stalls, a carboned-up actuator reports itself as an electrical fault.
Quick facts
- System
- Powertrain
- Category
- Emissions / EGR
- Severity
- Medium severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $100 – $950
- DIY difficulty
- Intermediate DIY
Browse every code in P2100–P2199, or start from the full code library.
What does P2141 mean?
P2141 sets when the module commands the exhaust gas recirculation throttle actuator and sees the voltage on its control circuit sitting low when the commanded state says it should be otherwise. It is a circuit verdict on a control line, not a flow measurement and not a comment on the EGR valve.
The first thing to be clear about is what the hardware actually is, because the name is genuinely misleading and it costs people money. The EGR throttle is not in the exhaust. It is a motor-driven butterfly plate sitting in the intake tract, downstream of the air filter and the charge cooler on a turbocharged engine, ahead of where recirculated gas joins the intake. Its job is a pressure job. Exhaust gas only flows into the intake if exhaust pressure is higher than intake pressure, and at light load on a modern engine that is not reliably true — the intake can be sitting at or above exhaust backpressure, at which point opening the EGR valve achieves nothing. Partly closing this intake butterfly drops intake pressure and restores the differential, so the recirculated gas has somewhere to go. On many diesel applications the same actuator does a second job: at key-off it shuts the intake completely, choking the engine so it stops cleanly instead of running down on its own compression.
So a code with EGR in the name points at a component in the intake, which is why parts get ordered for the wrong end of the engine. Anyone working this code should physically locate the actuator before pricing anything.
The second thing worth knowing is why the low-side verdict so often turns out to be a mechanical problem. The actuator is driven by a module output that monitors itself. When the plate is free, the motor draws a modest current and the control line behaves as commanded. When the plate is not free, the motor stalls against whatever is holding it and draws locked-rotor current — several times normal — and the driver pulls the line down and folds rather than letting the winding cook. What the module records is a circuit fault, because from its point of view the line did not behave. What is actually wrong is that the butterfly could not move.
And on this particular component, not being free is the normal ageing outcome rather than the unusual one. The EGR throttle sits exactly where recirculated exhaust soot meets cooled, humid intake air. That mixture deposits a hard, tarry film on the plate and, more importantly, in the narrow clearance around its edge and on the shaft where it passes through the housing. It accumulates for tens of thousands of miles doing nothing noticeable, because the plate spends most of its life near one end of its travel, and then one day the actuator is asked to move it through a region that has silted up and it cannot. That is why so many of these codes appear abruptly on a vehicle with no history of running problems, and why cleaning or replacing the actuator assembly resolves a fault that reads on the scan tool as wiring.
None of that means the wiring can be skipped. A signal wire rubbed through against the intake casting, a corroded connector, or a shorted motor winding all produce the same verdict and all need ruling out. But the ordering matters: on this component, checking whether the plate moves freely is fast, cheap and correct to do early, and a technician who tests only the circuit can find nothing wrong and hand the vehicle back with the code intact.
Common causes
- Carbon and soot binding the throttle plate or its shaft so the motor stalls
- Motor winding shorted internally, pulling the control circuit down
- Control wire chafed through against the intake casting or a bracket
- Short to ground anywhere along the actuator's control circuit
- Corroded or water-damaged terminals in the actuator connector
- Seized or worn actuator gear train inside the assembly
- Failed position feedback element inside the actuator affecting its control loop
- Module output driver damaged after repeated overcurrent events
- Heavy intake carbon fouling following extended low-load or short-trip use
- Previous repair leaving the harness routed against a hot or sharp surface
Symptoms
- Check engine light with a stored EGR throttle control circuit code
- Engine that drives largely normally, since the plate defaults to open
- Rough or extended engine shutdown on diesel applications that use the actuator as an air shutoff
- Elevated emissions readings or a failed emissions test
- Reduced power or a limp strategy on applications that derate on this fault
- Intake throttle position in live data not following the commanded value
- Recurring EGR flow codes stored alongside this one
- Soot visible around the actuator shaft or housing on inspection
- Code returning shortly after clearing with no change in behaviour
- Increased regeneration frequency on diesel applications with a particulate filter
Diagnostic steps
- 1.Physically locate the EGR throttle actuator before ordering anything. It is in the intake tract, not the exhaust, and the code's name sends people to the EGR valve for no reason.
- 2.Command the actuator with a bidirectional scan tool and watch its reported position. An actuator that does not move, or moves partway and stops, is telling you the problem is mechanical before any meter comes out.
- 3.Remove the actuator or its inlet duct and check the plate by hand. Binding, gritty movement or a plate that will not pass through part of its arc is the fault, and it is common enough to be worth checking early.
- 4.Inspect the shaft where it passes through the housing. Deposits build in that clearance and around the plate edge, and a plate that looks clean on its face can still be seized at the shaft.
- 5.Check the control circuit for a short to ground with the actuator disconnected and the module unplugged. Any path to ground on the control line is the fault.
- 6.Measure the actuator motor's resistance across its terminals and compare against specification. A shorted winding drags the circuit down and mimics wiring damage exactly.
- 7.Inspect the connector for corrosion, moisture and backed-out terminals. The actuator sits in a cool, damp part of the intake and its connector is not a dry environment.
- 8.Trace the harness run for chafing against the intake casting, a bracket or a clamp, paying attention to anywhere a previous repair has re-routed it.
- 9.Check for stored EGR flow codes alongside this one. A flow code plus a throttle circuit code usually has a single cause on the intake side rather than two separate problems.
- 10.After cleaning or replacing the actuator, command it through its full travel and confirm the reported position tracks the command end to end before returning the vehicle.
Repair cost
$100 – $950
Diagnosis is $110 to $220 and should include a physical check of the plate, not just circuit testing. Cleaning the actuator and the surrounding intake passage is $150 to $450 depending on how much has to come off to reach it, and it resolves a meaningful share of these codes outright. A replacement EGR throttle or intake throttle actuator assembly is $200 to $650 in parts with 1 to 3 hours of labour, and the assembly is usually sold complete because the motor and position feedback are not separately serviced. A wiring or connector repair is $90 to $280. Diesel applications with heavy soot loading run at the top of the range because the intake often needs decarbonising as well.
Estimate your repair
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DIY vs shop
This is an intermediate DIY job. It usually involves diagnostic steps, specialty parts, and some careful work in tight spaces. If you have the tools and a service manual or trustworthy video for your specific vehicle, it is achievable in a weekend. Otherwise, a competent independent shop will be faster.