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Home / DTC / P2801 — Transmission Range Sensor B Circuit Range/Performance

P2801 — Transmission Range Sensor B Circuit Range/Performance

Detailed page for trouble code P2801.

34,413codes
59brands
11,922generic
22,491specific
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Code

P2801

Generic P — Powertrain

Transmission Range Sensor B Circuit Range/Performance

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged, corroded or loose wiring/connectors in TR sensor B circuit
  • Faulty Transmission Range Sensor B (internal failure or contamination)
  • Poor ground or lost 5V/reference supply to the sensor
  • Incorrectly adjusted or mechanically damaged shift lever/selector mechanism
  • Intermittent open/short to power or ground
  • PCM/TCM internal fault or software issue

Symptoms

  • Check Engine/MIL illumination
  • Erratic or incorrect gear position indicated on dash (wrong gear light)
  • Transmission may not shift correctly or may go into limp/backup mode
  • Vehicle may not start in gear (safety/neutral start circuit affected)
  • Intermittent or constant inability to select certain gears

What to check

  • Scan for stored and pending codes, record freeze-frame and readiness status
  • Verify battery voltage and charging system (low voltage can affect sensors)
  • Visually inspect TR sensor B connector and wiring for damage, corrosion, or water
  • Using a scan tool, monitor TR sensor B live data while moving shift lever through all positions — signal should change smoothly
  • Back-probe connector: check for reference voltage (typically a regulated 5V), signal voltage variation, and solid ground
  • Check for continuity and shorts between the sensor signal, reference, ground and PCM/TCM pins

Signal parameters

  • Reference voltage commonly ~5.0 V (verify for specific vehicle); must be present at sensor connector
  • Signal voltage should vary smoothly through the range when shifting (typical min ≈ 0.1–0.5 V to max ≈ 4.5–4.9 V depending on vehicle)
  • No rapid jumps, open-circuit (floating) or stuck readings — changes should correspond to gear positions
  • Good continuity to ground and stable signal return; no short to battery or ground

Diagnostic algorithm

  1. Retrieve codes and freeze frame with an OBD-II scan tool. Note any related transmission or start safety codes.
  2. Perform a visual inspection of the TR sensor B connector and wiring harness; repair damaged insulation, pins, or corrosion.
  3. With ignition ON (engine off), back-probe the sensor connector: verify reference voltage, signal voltage and ground presence. Compare to expected ranges for the vehicle.
  4. With a scan tool, monitor TR sensor B output while moving the shift lever through all positions. Confirm the signal changes smoothly and matches reported gear position.
  5. If signal is stuck, intermittent or out of range: check continuity from sensor pins to PCM/TCM. Repair any open, short or high-resistance conditions.
  6. If wiring and connectors are good but signal incorrect, replace the Transmission Range Sensor B. Re-test live data to confirm proper operation.
  7. If new sensor and wiring checks pass but fault repeats, inspect shift linkage/selector for mechanical issues or misadjustment.
  8. If all external tests pass and problem persists, consider PCM/TCM diagnosis or software update per manufacturer procedure.
  9. Clear codes and perform a road test to verify repair; re-scan for any return codes and confirm readiness.

Likely causes

  • Wiring/connector corrosion, loose pin, or chafed harness in sensor B circuit
  • Failed transmission range sensor (B)
  • Loss of reference voltage or ground at the sensor
  • Misadjusted shift selector or linkage

Fault status

⚠️ Status
PCM/TCM detected Transmission Range Sensor B circuit out of normal range or performance. DTC P2801 set, MIL may illuminate and transmission may enter limp mode or disable certain gear functions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

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Code

P2801

LAND ROVER P — Powertrain

Transmission Range Sensor B - Circuit Range/Performance

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged, corroded or loose wiring/connectors in TR sensor B circuit
  • Faulty Transmission Range Sensor B (internal failure or contamination)
  • Poor ground or lost 5V/reference supply to the sensor
  • Incorrectly adjusted or mechanically damaged shift lever/selector mechanism
  • Intermittent open/short to power or ground
  • PCM/TCM internal fault or software issue

Symptoms

  • Check Engine/MIL illumination
  • Erratic or incorrect gear position indicated on dash (wrong gear light)
  • Transmission may not shift correctly or may go into limp/backup mode
  • Vehicle may not start in gear (safety/neutral start circuit affected)
  • Intermittent or constant inability to select certain gears

What to check

  • Scan for stored and pending codes, record freeze-frame and readiness status
  • Verify battery voltage and charging system (low voltage can affect sensors)
  • Visually inspect TR sensor B connector and wiring for damage, corrosion, or water
  • Using a scan tool, monitor TR sensor B live data while moving shift lever through all positions — signal should change smoothly
  • Back-probe connector: check for reference voltage (typically a regulated 5V), signal voltage variation, and solid ground
  • Check for continuity and shorts between the sensor signal, reference, ground and PCM/TCM pins

Signal parameters

  • Reference voltage commonly ~5.0 V (verify for specific vehicle); must be present at sensor connector
  • Signal voltage should vary smoothly through the range when shifting (typical min ≈ 0.1–0.5 V to max ≈ 4.5–4.9 V depending on vehicle)
  • No rapid jumps, open-circuit (floating) or stuck readings — changes should correspond to gear positions
  • Good continuity to ground and stable signal return; no short to battery or ground

Diagnostic algorithm

  1. Retrieve codes and freeze frame with an OBD-II scan tool. Note any related transmission or start safety codes.
  2. Perform a visual inspection of the TR sensor B connector and wiring harness; repair damaged insulation, pins, or corrosion.
  3. With ignition ON (engine off), back-probe the sensor connector: verify reference voltage, signal voltage and ground presence. Compare to expected ranges for the vehicle.
  4. With a scan tool, monitor TR sensor B output while moving the shift lever through all positions. Confirm the signal changes smoothly and matches reported gear position.
  5. If signal is stuck, intermittent or out of range: check continuity from sensor pins to PCM/TCM. Repair any open, short or high-resistance conditions.
  6. If wiring and connectors are good but signal incorrect, replace the Transmission Range Sensor B. Re-test live data to confirm proper operation.
  7. If new sensor and wiring checks pass but fault repeats, inspect shift linkage/selector for mechanical issues or misadjustment.
  8. If all external tests pass and problem persists, consider PCM/TCM diagnosis or software update per manufacturer procedure.
  9. Clear codes and perform a road test to verify repair; re-scan for any return codes and confirm readiness.

Likely causes

  • Wiring/connector corrosion, loose pin, or chafed harness in sensor B circuit
  • Failed transmission range sensor (B)
  • Loss of reference voltage or ground at the sensor
  • Misadjusted shift selector or linkage

Fault status

⚠️ Status
PCM/TCM detected Transmission Range Sensor B circuit out of normal range or performance. DTC P2801 set, MIL may illuminate and transmission may enter limp mode or disable certain gear functions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0705 P0706 P0708 P0709 P0715 P0720
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LAND ROVER

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