P213B

Code

Generic P — Powertrain

EGR Throttle Control Circuit B Range/Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 28 EN: 90 RU: 48

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Page language: EN

Causes

Damaged wiring or poor connector connection at EGR throttle actuator/sensor (circuit B)
Open or short to battery or ground in circuit B
Corroded or loose connector terminals
Failed EGR throttle actuator or position sensor (internal fault on channel B)
Mechanical binding or contamination of EGR throttle plate or actuator
Low battery/charging voltage or poor ground

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power or limp-home mode
Hesitation, rough idle, or stalling
Poor throttle response or acceleration
Increased emissions or failed emissions test
Stored freeze frame and fault history in scan tool

What to check

Read and record freeze frame and all stored codes with a suitable scan tool; note live data and PID values for EGR throttle position A and B
Compare EGR throttle position B signal to channel A while cycling throttle/EGR commands via bidirectional scan tool
Visually inspect wiring and connectors at the EGR throttle assembly and ECM for damage, corrosion, or loose pins
Measure supply voltage and ground at the EGR throttle connector with key on engine off
Check for mechanical binding of the EGR throttle plate and correct operation when operated by hand or using a scan tool actuator command
Perform continuity and resistance checks between the connector pins and the ECM for circuit B

Signal parameters

Position sensor B idle/closed value: typically ~0.5 V (varies by manufacturer); wide open typically ~4.0–4.5 V
Position sensor B should track sensor A closely—difference usually
Supply voltage to sensor/actuator: battery voltage (~12 V) with key ON; check for voltage drop under cranking
Actuator driver current/coil resistance (if applicable): typically low ohms to tens of ohms — consult vehicle-specific data
When commanded to move, position B PID should change smoothly and follow commanded duty cycle or position percent

Diagnostic algorithm

Use a scan tool to read freeze frame and live data. Confirm P213B is current and note EGR throttle position A vs B behavior during key ON and while commanding EGR/throttle movement.
Visually inspect the EGR throttle assembly, connectors and wiring for damage, corrosion, or water ingress. Repair or replace damaged connectors/harness sections.
With key ON (engine OFF), measure reference voltage, signal voltage (sensor B), and ground at the EGR throttle connector. Verify supply and grounds are within tolerance.
Command the EGR throttle/EGR plate via an active test and observe PID B response. If sensor B does not move or is erratic while A responds normally, suspect circuit B or sensor B failure.
Perform continuity/resistance checks between the EGR throttle B pin and the ECM pin to find opens/shorts. Wiggle harness while monitoring signal for intermittent faults.
If wiring and connectors are good, bench test or replace the EGR throttle assembly or position sensor (or interchange A/B sensor inputs where applicable and safe to do) to confirm component fault.
After repair or replacement, clear codes, re-test with scan tool and perform road test to verify proper operation and that the code does not return.
If fault persists after component and wiring checks, consider ECM diagnostics or reflashing per manufacturer procedures.

Likely causes

Intermittent/failed connector or pin (water ingress, corrosion)
Broken/shorted harness between ECM and EGR throttle assembly on circuit B
Failed position sensor element or actuator driver for circuit B
Stuck EGR throttle plate preventing expected position feedback
Low system voltage or poor ground affecting sensor readings

Fault status

⚠️ Status

ECM detected EGR throttle control circuit B out-of-range or poor performance; fault stored and MIL set until confirmed repaired.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

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