B1990

Code

LAND ROVER B — Body

Feedback from the potentiometer for the forward / backward of the pedal - failure in circuit

Brand: LAND ROVER

Type: B — Body

Views: UK: 13 EN: 28 RU: 14

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Page language: EN

Causes

Open or short in the potentiometer signal wiring
Corroded, loose or damaged connector at the pedal or ECU
Failed/dirty/contaminated potentiometer inside the pedal assembly
Poor ground or lost reference voltage to the sensor
Intermittent wiring fault due to pinching, chafing or connector movement
ECU input circuit fault or internal module error

Symptoms

Malfunction Indicator Lamp (MIL) or warning lamp illuminated
Reduced or erratic throttle/pedal response
Vehicle enters limp/reduced-power mode
Cruise control disabled or unavailable
Stored B1990 and possibly related pedal/throttle sensor codes
Intermittent pedal dead zone or sudden jumps in pedal reading

What to check

Visual inspection of pedal assembly, harness and connector for damage, corrosion or water
Scan for additional codes and view freeze frame/live data of pedal position(s)
Wiggle test harness and connector while monitoring live data for intermittent change
Check for proper reference voltage (typically ~5V) and ground at the sensor connector
Measure sensor output voltage while moving the pedal through full travel
Compare sensor output(s) to each other if redundant signals are present

Signal parameters

Reference supply: typically ≈5V from ECU (measure at sensor connector)
Ground: 0V reference at sensor ground pin
Sensor output: typically ~0.5–4.5 V across pedal travel (rest to full travel) — consult OEM data
Dual/ redundant sensors: outputs should track each other (one may be inverse), not diverge
Sensor impedance: typically low kilo-ohm range (consult OEM spec before resistance tests)

Diagnostic algorithm

Read and record all codes and freeze-frame data. Note if multiple pedal/throttle codes are present.
Perform a visual inspection of the pedal, connector and harness for damage, corrosion or water ingress.
Clear the code and attempt to recreate the fault while monitoring pedal position live data to confirm behavior.
With ignition ON, backprobe the pedal connector: verify reference voltage (≈5V) and ground are present and stable.
Measure the potentiometer output voltage(s) while slowly moving the pedal through full travel. Compare to expected linear change and OEM values.
Perform a wiggle/stress test of the wiring and connector while observing live data to reveal intermittent faults.
If outputs are open/shorted or out of range at the pedal connector, disconnect harness and measure continuity to the ECU pin(s). Repair broken wires/terminals as needed.
If wiring and connector are good but sensor outputs are incorrect, replace the pedal sensor/assembly and retest.
If sensor outputs at the pedal are correct but ECU sees incorrect values at ECU connector, test/repair harness between pedal and ECU or evaluate ECU input circuit for fault.
After repair, clear codes and perform a drive/operation cycle to confirm the fault does not return.

Likely causes

Damaged wiring or poor connector contact at the pedal harness
Failed pedal potentiometer (sensor inside pedal assembly)
Corroded/contaminated connector causing intermittent/open circuit
Loss of reference 5V or ground at the pedal sensor

Fault status

⚠️ Status

Pedal forward/back potentiometer feedback circuit fault — open/short/out-of-range or inconsistent signal detected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5 - 2.0 hours

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B1990 — Feedback from the potentiometer for the forward / backward of the pedal - failure in circuit