P045B

Code

LAND ROVER P — Powertrain

Exhaust Gas Recirculation - B - Control Circuit - Range performance

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 15 EN: 243 RU: 17

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Page language: EN

Causes

Faulty EGR valve (sticking, worn, or failed position sensor)
Faulty EGR control solenoid/actuator
Wiring damage (open, short to power/ground) or poor connector connection at EGR circuit
Poor ground or voltage supply to the EGR control
Carbon buildup blocking EGR passages (mechanical restriction)
PCM/software fault or incorrect calibration

Symptoms

Check Engine Light / MIL illuminated with P045B stored
Reduced engine performance, hesitation or rough idle
Reduced fuel economy
Possible increased NOx emissions or failed emissions test
Engine surging or stumble during part-throttle cruise
Possible hard starting if EGR stuck open

What to check

Read all stored codes and freeze-frame data; note related EGR/EVAP codes
Capture live data: commanded EGR position/flow vs actual/feedback values
Visually inspect EGR valve, solenoid and wiring harness for damage or corrosion
Backprobe connector: verify reference voltage, signal voltage, and ground
Measure resistance of EGR solenoid/actuator and compare to spec
Check for vacuum leaks and condition of vacuum lines (if vacuum‑actuated)

Signal parameters

EGR position sensor voltage (typical 0.5–4.5 V depending on position; should change smoothly with commanded movement)
EGR command signal (duty cycle or voltage) from PCM: varies with load/engine speed
EGR solenoid coil resistance (typical small-ohm range; check service data)
Supply/reference voltage to EGR circuit (usually battery/ignition switched 12 V or regulated reference)
Ground continuity: near 0 Ω to chassis ground

Diagnostic algorithm

Verify P045B is current and note freeze-frame. Scan for additional EGR/engine codes.
With key ON engine OFF, inspect connectors and wiring at EGR valve/solenoid for corrosion, looseness, or damage; repair as needed.
Use live data to compare PCM commanded EGR position/flow vs actual feedback. If feedback does not change when commanded, proceed.
Backprobe the EGR connector: verify proper reference/supply voltage and good ground. Check signal waveform/voltage while commanding EGR on a diagnostic tool.
Measure resistance of the EGR solenoid/actuator and compare to manufacturer specification. Replace if out of range or open.
If vacuum‑actuated, verify vacuum supply and test actuator movement with vacuum pump while commanding; check for leaks.
Remove and inspect the EGR valve and passages for carbon restriction. Clean or replace valve if mechanically stuck or heavily soiled.
If valve moves and electricals are good but feedback still incorrect, test or replace EGR position sensor (if applicable).
Repair any wiring harness faults (shorts, opens, poor grounds) and recheck function.
If electrical and mechanical systems check good, consider PCM reflash or replacement after confirming with manufacturer technical info.
Clear codes and perform road test to verify the fault does not return.

Likely causes

Stuck or carbon-bound EGR valve preventing commanded movement
Corroded/loose connector or damaged harness at EGR valve/solenoid
Failed EGR position sensor (if equipped) or incorrect sensor output
Failed EGR control solenoid/actuator
Intermittent ground or low battery/charging voltage affecting control

Fault status

⚠️ Status

P045B — EGR B Control Circuit Range/Performance: EGR control not achieving expected range or feedback differs from commanded value; inspect EGR valve/actuator, wiring, and control circuit.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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P045B — Exhaust Gas Recirculation - B - Control Circuit - Range performance