Home / DTC / P07B3 — Transmission Park Position Sensor/Switch A Circuit Low

P07B3 — Transmission Park Position Sensor/Switch A Circuit Low

Detailed page for trouble code P07B3.

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Code

P07B3

Generic P — Powertrain

Transmission Park Position Sensor/Switch A Circuit Low

Brand: Generic
Views: UK: 16 EN: 25 RU: 15
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground on the Park position sensor/switch A signal wire
  • Open or damaged wiring harness or chafed insulation touching ground
  • Corroded or loose connector at the sensor or PCM
  • Faulty park position sensor/switch (internal short or stuck closed contact)
  • PCM or body control module internal fault (less common)
  • Water or contamination in connector causing low resistance to ground

Symptoms

  • Malfunction Indicator Lamp (MIL) or transmission warning lamp illuminated
  • Vehicle may not start (won't crank) if PCM cannot detect Park/Neutral
  • Transmission stuck in Park or fails to shift properly
  • Incorrect PRNDL display or gear indicator
  • Intermittent no-start or unexpected neutral/park behavior
  • Stored trouble code and possible limp-home mode

What to check

  • Read and record freeze frame and live data for transmission range/park switch
  • Visual inspection of transmission range/park switch connector and wiring for damage, corrosion, or water intrusion
  • Backprobe the Park A signal with a DVOM while moving shift lever through positions
  • Check for proper reference voltage (5V) at the PCM and pull-up on the signal circuit
  • Check continuity to ground and to the PCM pin (with ignition off)
  • Wiggle test wiring while monitoring signal to detect intermittent faults

Signal parameters

  • PCM reference voltage: typically 5.0 V (verify vehicle spec)
  • Expected Park A signal: near 0 V (ground) when switch closed in Park, ≈4.5–5.0 V when open (other positions)
  • Circuit Low condition: signal stuck near 0–0.5 V across all gear positions
  • Switch resistance: near 0 Ω when closed (Park), open/infinite when open (verify with service manual)
  • Typical pull-up resistor built into PCM or module; measure with sensor disconnected to confirm pull-up to reference voltage

Diagnostic algorithm

  1. Retrieve codes and freeze frame; verify P07B3 is current and note conditions (ignition state, gear position).
  2. Visually inspect the transmission-range/park switch connector and wiring for damage, corrosion, or moisture; repair obvious issues.
  3. With key ON (engine off) backprobe the Park A signal at the sensor connector and at the PCM connector. Verify PCM reference/pull-up voltage present at PCM with sensor connected and disconnected.
  4. Operate the shift lever through all positions while observing the Park A signal. Confirm expected transition: low (≈0 V) in Park, high (≈5 V) in other positions. If signal remains low in all positions, suspect short to ground.
  5. If low in all positions, disconnect the sensor and measure continuity between the signal wire and chassis ground. A direct short (near 0 Ω) indicates wiring short or pin contact; repair wiring.
  6. If no short to ground when sensor disconnected but signal still low at PCM, suspect internal PCM fault or poor PCM connector terminal—inspect and repair connector pins and retest.
  7. If wiring and PCM check good, bench-test or replace the park position sensor/switch and re-test. Confirm new sensor produces correct voltages/resistances.
  8. After repair, clear codes, perform functional test and road test to verify the DTC does not return and that Park/Neutral detection and starting behavior are normal.

Likely causes

  • Connector corrosion at transmission-range/park switch
  • Broken or pinched signal wire shorted to chassis ground
  • Faulty park position sensor/switch A (internal failure)
  • Poor mating pin at PCM or bent terminal creating low resistance path
  • Aftermarket accessories or improper repairs that damaged wiring

Fault status

⚠️ Status
Circuit Low on Transmission Park Position Sensor/Switch A: PCM detects the Park A signal at low voltage (shorted or stuck to ground) when it should be high in non-Park positions or varying with gear selection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P07B3

LAND ROVER P — Powertrain

Transmission Park Position Sensor A - Low Circuit

Views: UK: 8 EN: 9 RU: 5
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground on the Park position sensor/switch A signal wire
  • Open or damaged wiring harness or chafed insulation touching ground
  • Corroded or loose connector at the sensor or PCM
  • Faulty park position sensor/switch (internal short or stuck closed contact)
  • PCM or body control module internal fault (less common)
  • Water or contamination in connector causing low resistance to ground

Symptoms

  • Malfunction Indicator Lamp (MIL) or transmission warning lamp illuminated
  • Vehicle may not start (won't crank) if PCM cannot detect Park/Neutral
  • Transmission stuck in Park or fails to shift properly
  • Incorrect PRNDL display or gear indicator
  • Intermittent no-start or unexpected neutral/park behavior
  • Stored trouble code and possible limp-home mode

What to check

  • Read and record freeze frame and live data for transmission range/park switch
  • Visual inspection of transmission range/park switch connector and wiring for damage, corrosion, or water intrusion
  • Backprobe the Park A signal with a DVOM while moving shift lever through positions
  • Check for proper reference voltage (5V) at the PCM and pull-up on the signal circuit
  • Check continuity to ground and to the PCM pin (with ignition off)
  • Wiggle test wiring while monitoring signal to detect intermittent faults

Signal parameters

  • PCM reference voltage: typically 5.0 V (verify vehicle spec)
  • Expected Park A signal: near 0 V (ground) when switch closed in Park, ≈4.5–5.0 V when open (other positions)
  • Circuit Low condition: signal stuck near 0–0.5 V across all gear positions
  • Switch resistance: near 0 Ω when closed (Park), open/infinite when open (verify with service manual)
  • Typical pull-up resistor built into PCM or module; measure with sensor disconnected to confirm pull-up to reference voltage

Diagnostic algorithm

  1. Retrieve codes and freeze frame; verify P07B3 is current and note conditions (ignition state, gear position).
  2. Visually inspect the transmission-range/park switch connector and wiring for damage, corrosion, or moisture; repair obvious issues.
  3. With key ON (engine off) backprobe the Park A signal at the sensor connector and at the PCM connector. Verify PCM reference/pull-up voltage present at PCM with sensor connected and disconnected.
  4. Operate the shift lever through all positions while observing the Park A signal. Confirm expected transition: low (≈0 V) in Park, high (≈5 V) in other positions. If signal remains low in all positions, suspect short to ground.
  5. If low in all positions, disconnect the sensor and measure continuity between the signal wire and chassis ground. A direct short (near 0 Ω) indicates wiring short or pin contact; repair wiring.
  6. If no short to ground when sensor disconnected but signal still low at PCM, suspect internal PCM fault or poor PCM connector terminal—inspect and repair connector pins and retest.
  7. If wiring and PCM check good, bench-test or replace the park position sensor/switch and re-test. Confirm new sensor produces correct voltages/resistances.
  8. After repair, clear codes, perform functional test and road test to verify the DTC does not return and that Park/Neutral detection and starting behavior are normal.

Likely causes

  • Connector corrosion at transmission-range/park switch
  • Broken or pinched signal wire shorted to chassis ground
  • Faulty park position sensor/switch A (internal failure)
  • Poor mating pin at PCM or bent terminal creating low resistance path
  • Aftermarket accessories or improper repairs that damaged wiring

Fault status

⚠️ Status
Circuit Low on Transmission Park Position Sensor/Switch A: PCM detects the Park A signal at low voltage (shorted or stuck to ground) when it should be high in non-Park positions or varying with gear selection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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