P1222

Code

LAND ROVER P — Powertrain

Pedal demand sensor circuit B low input

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 19 EN: 30 RU: 32

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Page language: EN

Causes

Open or shorted wiring in pedal sensor B circuit
Corroded or loose connector at pedal sensor or PCM
Faulty pedal demand (accelerator pedal position) sensor — channel B
Low or missing 5V reference or poor ground
Water ingress or contamination in connector
Intermittent wiring damage (chafing, pinched wire)

Symptoms

Check Engine Light (MIL) illuminated
Reduced engine power or limp-home mode
Poor or no throttle response to pedal input
Cruise control disabled
Possible diagnostic trouble codes for throttle/pedal correlation

What to check

Read and record codes and freeze-frame data with OBD-II scanner
Check for related throttle/pedal codes (correlation codes)
Visually inspect pedal sensor connector and wiring for corrosion, damage or water
Back-probe pedal sensor connector and verify 5V reference and ground present with ignition ON
Measure pedal sensor B output voltage while slowly pressing pedal — note behavior and compare to sensor A if available
Wiggle wiring harness and connector while watching live data for intermittent changes

Signal parameters

Typical reference voltage: ~5.0 V (ignition ON) to the pedal sensor (verify with vehicle-specific data)
Expected pedal sensor output range: roughly 0.5–4.5 V across pedal travel (varies by design)
’B low’ condition: sensor B voltage below expected low threshold (often
Redundant/dual sensor behavior: channel A and B should correlate (often opposite slopes) — compare both live traces

Diagnostic algorithm

Connect a capable scan tool and note P1222 and any other related codes; record live data for pedal channels A and B.
Visually inspect the accelerator pedal sensor connector, wiring harness, and PCM connector for corrosion, bent pins, or damage.
With ignition ON (engine off), back-probe sensor connector: verify 5V reference voltage and good ground. If reference or ground missing, trace to fuse, power supply and ground point.
Measure sensor B output voltage while slowly operating the pedal. Confirm whether the signal is low at rest and whether it changes smoothly. Compare to channel A output; look for inconsistent correlation.
Perform continuity/resistance check between sensor B signal pin and the PCM signal input pin to check for open or short to ground/voltage. Repair any wiring faults.
If wiring and connectors test good and voltages are correct, replace the pedal demand sensor assembly (or sensor module) and clear codes.
After repair, erase codes, retest live data during pedal operation, and perform a road test to confirm normal throttle response and that the code does not return.
If fault persists after sensor replacement and wiring verified, consider PCM input circuit diagnosis or professional electrical fault tracing.

Likely causes

Wiring shorted to ground on pedal sensor B signal
Corroded/pushed-back terminal in pedal sensor connector
Internal failure of the pedal demand sensor (channel B)
Broken/abraded wire between sensor and PCM
Poor battery/engine ground affecting sensor reference

Fault status

⚠️ Status

PCM detected pedal demand sensor B voltage below expected threshold or inconsistent with redundant inputs; DTC P1222 stored. May cause throttle response reduction or limp mode. Inspect wiring, connector, sensor B channel, and related reference/ground circuits.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

Repair manuals

Manual library for LAND ROVER

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Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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P1222 — Pedal demand sensor circuit B low input