P213C — Exhaust Gas Recirculation Throttle Control Circuit “B” Low #

The definition of this code may vary depending on the vehicle manufacturer (OEM). Below are known variations of the code description by OEM:

• Ford: EGR Throttle Control Circuit “B” Low
• GM: Exhaust Gas Recirculation Throttle Control B Circuit Low Voltage
• Chrysler: EGR Throttle Control Circuit “B” Low Input
• Toyota: EGR Throttle Actuator Control Circuit Low (Bank B)

Summary of Code P213C #

P213C is an OBD-II diagnostic trouble code (DTC) that indicates a problem with the Exhaust Gas Recirculation (EGR) throttle control circuit “B”. The EGR system is designed to recirculate a portion of the exhaust gases back into the engine’s intake, reducing nitrogen oxide (NOx) emissions and improving fuel efficiency. The “B” circuit typically refers to a secondary control or feedback sensor involved in the EGR throttle actuator mechanism. When the engine control module (ECM) detects a voltage lower than expected from this circuit, it sets the P213C code. This issue often triggers the check engine light and may affect engine performance or emissions.

Common Symptoms for Code P213C #

When code P213C is stored, drivers and technicians may notice several symptoms, some subtle and others more apparent. In most cases, the issue is linked to the EGR system’s function, which can affect how the engine runs and responds.

• Illuminated check engine light (CEL/MIL)
• Rough idling, especially when the engine is cold or just after startup
• Reduced engine power or limp mode activation
• Poor acceleration or hesitation on throttle input
• Increased NOx emissions (may be picked up during a smog test)
• Potential knocking or pinging sounds from the engine

Likely Causes of Code P213C (Ranked by Frequency) #

Several culprits can trigger the P213C code. Typically, the fault lies within the EGR throttle control circuit, but related components or wiring may also be at play. Below is a list of the most common causes, ordered from most to least frequent:

1. Faulty EGR throttle actuator: The actuator, which regulates the flow of exhaust gas, may have failed or developed internal faults.
2. Wiring issues: Damaged, corroded, or shorted wires in the EGR throttle control “B” circuit can cause low voltage readings.
3. Poor electrical connections: Loose or oxidized connectors at the EGR throttle actuator or ECM can disrupt the circuit.
4. Failed EGR position sensor: The sensor monitoring the EGR valve’s position may be malfunctioning.
5. ECM (Engine Control Module) malfunction: Though rare, a fault within the ECM itself may be responsible.

Step-by-Step Diagnostic Process for Code P213C #

Diagnosing P213C requires a systematic approach to pinpoint the cause of the low voltage condition in the EGR throttle control circuit “B.” Here’s how technicians typically tackle it:

• Verify the code and check for any related DTCs using a professional scan tool.
• Inspect the EGR system, focusing on the throttle actuator and its wiring harness.
• Check for damaged, corroded, or loose connectors at the EGR throttle actuator and ECM.
• Test the EGR throttle actuator for proper operation using a digital multimeter to confirm voltage and continuity.
• Inspect the EGR position sensor and associated wiring for faults.
• If all external checks pass, perform an ECM output test to rule out module failure.
• Clear the code and test drive the vehicle to confirm the repair.

Possible Repairs for Code P213C #

Depending on the root cause, several repairs may correct the P213C code. Each repair targets a specific failure point within the EGR throttle control system:

• Repair or replace damaged wiring or connectors in the EGR throttle control “B” circuit.
• Replace the EGR throttle actuator if it is found faulty or non-responsive.
• Clean and secure all electrical connections related to the EGR system.
• Replace a failed EGR position sensor if it cannot report accurate valve position.
• Reprogram or replace the ECM if all other repairs do not resolve the issue.

Is It Safe to Drive with Code P213C? #

Driving with code P213C is not recommended for extended periods. While the vehicle may remain drivable, the EGR system’s malfunction can lead to increased emissions and, in some cases, engine performance problems such as reduced power or rough running. Prolonged operation with this fault may also cause additional damage to the EGR valve or catalytic converter. For safety and to avoid further repairs, it’s best to address the issue as soon as possible.

Vehicles Most Commonly Affected by Code P213C #

While P213C can occur in various makes and models, it is more frequently found in vehicles using electronically controlled EGR throttle actuators, particularly those with stricter emission controls from the mid-2000s onward.

• Ford F-Series, Edge, and Explorer (mid-2010s models)
• Chevrolet Silverado and Equinox (2010s models)
• Chrysler 200/300 and Jeep Grand Cherokee (with V6 engines)
• Toyota Camry and Tacoma (select models with EGR throttle control)
• Some Mazda, Hyundai, and Kia models with advanced EGR systems

Common Mistakes & Best Practices for Code P213C #

Technicians and DIYers sometimes fall into traps when diagnosing or repairing P213C. Avoiding these pitfalls ensures a faster, more accurate fix:

• Assuming the EGR actuator is at fault without checking wiring or connectors.
• Overlooking intermittent wiring problems—wiggle test the harness for hidden faults.
• Clearing the code before fully diagnosing the issue, missing intermittent failures.
• Replacing the EGR valve or actuator without testing its operation with a multimeter.
• Failing to check for related codes that may give more context to the root cause.

FAQ for Code P213C #

Here are quick answers to common questions about P213C:

• Q: Can a dirty EGR valve cause P213C?
  A: While a dirty EGR valve can cause some EGR-related codes, P213C specifically refers to a low voltage issue in the throttle control circuit. However, buildup inside the actuator can sometimes cause electrical faults or mechanical binding.
• Q: Will replacing the EGR valve always fix P213C?
  A: Not necessarily. This code often involves the actuator or its circuit. Always diagnose wiring and connectors before replacing parts.
• Q: Is this code common after battery replacement?
  A: Rarely. But if connectors were disturbed or a voltage spike occurred during battery change, it’s possible—inspect connections carefully.