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Home / DTC / P099E — Shift Solenoid H Control Circuit Low

P099E — Shift Solenoid H Control Circuit Low

Detailed page for trouble code P099E.

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

P099E

Generic P — Powertrain

Shift Solenoid H Control Circuit Low

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

Causes

  • Open or shorted wiring in the solenoid H harness
  • Corroded, loose, or damaged connector at the solenoid or TCM/ECM
  • Failed shift solenoid H (coil short or open)
  • Ground short in control circuit (short to chassis ground)
  • Faulty TCM/ECM driver transistor or internal circuit
  • Low battery voltage or poor battery/charging system condition

Symptoms

  • Transmission warning light (MIL) or trans lamp illuminated
  • Erratic shifting, failure to shift, or stuck in a single gear (limp mode)
  • Delayed engagement or harsh shifts
  • Stored DTC P099E and possibly other transmission-related codes
  • Reduced drivability or loss of certain gear ranges

What to check

  • Read freeze frame and all stored codes; record conditions when code set
  • Perform a visual inspection of the transmission wiring harness, connectors, and solenoid connector for damage, corrosion, or bent pins
  • Check battery voltage and charging system for proper operation
  • Measure resistance of solenoid H with connector disconnected and compare to specification
  • Backprobe solenoid H control connector while commanding solenoid ON/OFF with a scan tool and observe voltage/pulse
  • Check continuity from solenoid control pin to TCM/ECM pin and for continuity to chassis ground

Signal parameters

  • Typical solenoid coil resistance (varies by vehicle): approx. 6 - 50 ohms; consult vehicle spec for exact value
  • Control type: usually a low-side driver (ECM grounds to activate) or PWM driver; inactive line ~ battery voltage (~12 V), active (grounded) ~ near 0–1 V
  • When commanded ON (for low-side driver): control pin at or near ground while coil sees battery supply through harness
  • When commanded OFF: control pin should be at battery voltage if no short to ground
  • PWM control (if used): frequency commonly 20–250 Hz; duty cycle varies with commanded pressure
  • If circuit is low: measured voltage at control pin will be near 0 V when solenoid is not commanded

Diagnostic algorithm

  1. Safety: Park on level ground, apply parking brake, chock wheels, and work with ignition off. Avoid shorting circuits while probing.
  2. Read codes and freeze-frame data with a capable scanner; note related transmission codes and operating conditions.
  3. Perform visual inspection of connectors, pins, and harness for damage, corrosion, or oil contamination at solenoid and TCM/ECM.
  4. Check battery voltage (should be ~12.4–12.8 V engine off and 13.5–14.8 V charging with engine running). Low system voltage can cause faults.
  5. With ignition OFF, disconnect the solenoid connector and measure coil resistance across solenoid H terminals. Compare to manufacturer spec. Open or shorted coil indicates solenoid replacement.
  6. Check for a short to ground: with connector disconnected, measure continuity between the control wire and chassis ground. If continuity is present, locate and repair wiring short.
  7. Backprobe the solenoid connector with a DVOM or oscilloscope. Command the solenoid ON using a scan tool and observe the control pin voltage. For low-side drivers, expect voltage near battery when OFF and near 0 V when ON. If voltage stays low when OFF, suspect short to ground or driver issue.
  8. Check continuity between the solenoid control pin and the TCM/ECM pin. Repair any open or high-resistance connections.
  9. If wiring and solenoid test good, command another known-good solenoid (if available) or swap solenoids per service manual to isolate the component. If the problem follows the solenoid, replace it.
  10. If the solenoid and wiring test good but the control line still reads low only at the TCM/ECM, suspect a failed TCM/ECM driver. Before replacing the module, re-check wiring, connectors, and grounds and consult manufacturer diagnosis procedures.
  11. After repair, clear codes, perform adaptations/relearn procedure if required, and road test to confirm proper operation and that the code does not return.

Likely causes

  • Wiring/connectors (corrosion, broken wire, poor pin contact)
  • Short to ground on the solenoid H control wire
  • Failed solenoid coil
  • Faulty TCM/ECM output driver

Fault status

⚠️ Status
Shift Solenoid H control circuit voltage low — possible short to ground, open/shorted solenoid coil, poor connector/wiring, or failed TCM/ECM driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-4.0 hours
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Code

P099E

LAND ROVER P — Powertrain

Solenoid change control H - low circuit

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

Causes

  • Open or shorted wiring in the solenoid H harness
  • Corroded, loose, or damaged connector at the solenoid or TCM/ECM
  • Failed shift solenoid H (coil short or open)
  • Ground short in control circuit (short to chassis ground)
  • Faulty TCM/ECM driver transistor or internal circuit
  • Low battery voltage or poor battery/charging system condition

Symptoms

  • Transmission warning light (MIL) or trans lamp illuminated
  • Erratic shifting, failure to shift, or stuck in a single gear (limp mode)
  • Delayed engagement or harsh shifts
  • Stored DTC P099E and possibly other transmission-related codes
  • Reduced drivability or loss of certain gear ranges

What to check

  • Read freeze frame and all stored codes; record conditions when code set
  • Perform a visual inspection of the transmission wiring harness, connectors, and solenoid connector for damage, corrosion, or bent pins
  • Check battery voltage and charging system for proper operation
  • Measure resistance of solenoid H with connector disconnected and compare to specification
  • Backprobe solenoid H control connector while commanding solenoid ON/OFF with a scan tool and observe voltage/pulse
  • Check continuity from solenoid control pin to TCM/ECM pin and for continuity to chassis ground

Signal parameters

  • Typical solenoid coil resistance (varies by vehicle): approx. 6 - 50 ohms; consult vehicle spec for exact value
  • Control type: usually a low-side driver (ECM grounds to activate) or PWM driver; inactive line ~ battery voltage (~12 V), active (grounded) ~ near 0–1 V
  • When commanded ON (for low-side driver): control pin at or near ground while coil sees battery supply through harness
  • When commanded OFF: control pin should be at battery voltage if no short to ground
  • PWM control (if used): frequency commonly 20–250 Hz; duty cycle varies with commanded pressure
  • If circuit is low: measured voltage at control pin will be near 0 V when solenoid is not commanded

Diagnostic algorithm

  1. Safety: Park on level ground, apply parking brake, chock wheels, and work with ignition off. Avoid shorting circuits while probing.
  2. Read codes and freeze-frame data with a capable scanner; note related transmission codes and operating conditions.
  3. Perform visual inspection of connectors, pins, and harness for damage, corrosion, or oil contamination at solenoid and TCM/ECM.
  4. Check battery voltage (should be ~12.4–12.8 V engine off and 13.5–14.8 V charging with engine running). Low system voltage can cause faults.
  5. With ignition OFF, disconnect the solenoid connector and measure coil resistance across solenoid H terminals. Compare to manufacturer spec. Open or shorted coil indicates solenoid replacement.
  6. Check for a short to ground: with connector disconnected, measure continuity between the control wire and chassis ground. If continuity is present, locate and repair wiring short.
  7. Backprobe the solenoid connector with a DVOM or oscilloscope. Command the solenoid ON using a scan tool and observe the control pin voltage. For low-side drivers, expect voltage near battery when OFF and near 0 V when ON. If voltage stays low when OFF, suspect short to ground or driver issue.
  8. Check continuity between the solenoid control pin and the TCM/ECM pin. Repair any open or high-resistance connections.
  9. If wiring and solenoid test good, command another known-good solenoid (if available) or swap solenoids per service manual to isolate the component. If the problem follows the solenoid, replace it.
  10. If the solenoid and wiring test good but the control line still reads low only at the TCM/ECM, suspect a failed TCM/ECM driver. Before replacing the module, re-check wiring, connectors, and grounds and consult manufacturer diagnosis procedures.
  11. After repair, clear codes, perform adaptations/relearn procedure if required, and road test to confirm proper operation and that the code does not return.

Likely causes

  • Wiring/connectors (corrosion, broken wire, poor pin contact)
  • Short to ground on the solenoid H control wire
  • Failed solenoid coil
  • Faulty TCM/ECM output driver

Fault status

⚠️ Status
Shift Solenoid H control circuit voltage low — possible short to ground, open/shorted solenoid coil, poor connector/wiring, or failed TCM/ECM driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-4.0 hours
413

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

LAND ROVER

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