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Home / DTC / P0998 — Shift Solenoid F Control Circuit Low

P0998 — Shift Solenoid F Control Circuit Low

Detailed page for trouble code P0998.

35,619codes
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11,925generic
23,694specific
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Code

P0998

Generic P — Powertrain

Shift Solenoid F Control Circuit Low

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

Causes

  • Open or high-resistance wiring in the Shift Solenoid F control circuit
  • Short to ground on the solenoid control wire
  • Corroded, loose, or damaged connector at the solenoid or TCM/PCM
  • Failed shift solenoid (coil open or degraded)
  • Faulty TCM/PCM driver transistor or module internal fault
  • Blown fuse or faulty transmission relay affecting solenoid supply

Symptoms

  • Check Engine/Transmission warning light (MIL) illuminated
  • Transmission stuck in limp/backup mode or limited gear availability
  • Harsh, delayed, or erratic gear shifts
  • Transmission may hold a gear or fail to engage certain gears
  • Reduced fuel economy or drivability issues
  • Fault code set for shift solenoid circuit

What to check

  • Read freeze frame and live data with a scan tool; verify P0998 and related codes
  • Visually inspect solenoid connector and wiring for damage, corrosion, pin pushed out
  • Check transmission fluid level and condition (low or contaminated fluid can affect operation)
  • Check related fuses and relays for continuity and correct operation
  • Measure solenoid coil resistance at the connector with the harness disconnected
  • Back-probe control wire to check for control voltage/PWM and for proper ground switching

Signal parameters

  • Typical coil resistance (varies by vehicle): approx. 5–35 ohms; consult vehicle spec
  • Open-circuit: very high resistance or infinite; Short: near 0 ohms
  • Control voltage when solenoid OFF: near battery voltage (nominal 12V) or open circuit (depends on driver type)
  • Control voltage when solenoid ON: near 0V if driver grounds the circuit, or switched to ground via PWM; many systems use PWM (20–200 Hz) to modulate pressure
  • Supply voltage at solenoid feed: battery voltage (nominal 11–14 V with engine running)
  • Note: exact values and PWM frequencies vary by manufacturer—always confirm factory specs

Diagnostic algorithm

  1. Use a scan tool to confirm P0998, review freeze-frame and any additional transmission codes.
  2. Visually inspect the solenoid harness and connector for corrosion, pin damage, or loose fit; repair as needed.
  3. With ignition off, disconnect solenoid connector and measure coil resistance across solenoid terminals; compare to spec. Replace solenoid if out of range or open.
  4. Reconnect and back-probe the control wire. With ignition on (engine off) and with engine running if safe, command solenoid ON/OFF using scan tool. Observe voltage at the control pin and behavior (should switch between near battery voltage and ground or show PWM).
  5. If control signal is absent or stuck low, check continuity from the solenoid connector to the TCM/PCM pin. Repair any open or damaged wiring.
  6. Check for short to ground or short to battery on the control circuit using an ohmmeter and isolated testing. Repair wiring faults.
  7. Verify supply fuse/relay feeding solenoid circuit is good and providing battery voltage to the feed side of the solenoid.
  8. If wiring and solenoid test good but driver output at the module is abnormal, suspect TCM/PCM driver failure—consult manufacturer guidance for module testing/programming; consider module replacement only after verifying external wiring and components.
  9. After repairs, clear codes and perform a road test and live-data verification to confirm proper shift solenoid operation and that P0998 does not return.
  10. If intermittent, inspect for chafing where harness contacts chassis or exhaust heat areas and secure/replace harness as required.

Likely causes

  • Broken wire or poor crimp at connector for Shift Solenoid F
  • Corrosion or water intrusion in the solenoid connector
  • Open solenoid coil (infinite or very high resistance)
  • Shorted solenoid control wire to ground (pulling voltage low)
  • Failed driver inside TCM/PCM that cannot source/sink correctly

Fault status

⚠️ Status
Shift Solenoid F Control Circuit Low — low voltage detected on the solenoid control circuit (possible open, short to ground, bad connector, failed solenoid or driver).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

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Code

P0998

LAND ROVER P — Powertrain

Shift solenoid control F - low circuit

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

Causes

  • Open or high-resistance wiring in the Shift Solenoid F control circuit
  • Short to ground on the solenoid control wire
  • Corroded, loose, or damaged connector at the solenoid or TCM/PCM
  • Failed shift solenoid (coil open or degraded)
  • Faulty TCM/PCM driver transistor or module internal fault
  • Blown fuse or faulty transmission relay affecting solenoid supply

Symptoms

  • Check Engine/Transmission warning light (MIL) illuminated
  • Transmission stuck in limp/backup mode or limited gear availability
  • Harsh, delayed, or erratic gear shifts
  • Transmission may hold a gear or fail to engage certain gears
  • Reduced fuel economy or drivability issues
  • Fault code set for shift solenoid circuit

What to check

  • Read freeze frame and live data with a scan tool; verify P0998 and related codes
  • Visually inspect solenoid connector and wiring for damage, corrosion, pin pushed out
  • Check transmission fluid level and condition (low or contaminated fluid can affect operation)
  • Check related fuses and relays for continuity and correct operation
  • Measure solenoid coil resistance at the connector with the harness disconnected
  • Back-probe control wire to check for control voltage/PWM and for proper ground switching

Signal parameters

  • Typical coil resistance (varies by vehicle): approx. 5–35 ohms; consult vehicle spec
  • Open-circuit: very high resistance or infinite; Short: near 0 ohms
  • Control voltage when solenoid OFF: near battery voltage (nominal 12V) or open circuit (depends on driver type)
  • Control voltage when solenoid ON: near 0V if driver grounds the circuit, or switched to ground via PWM; many systems use PWM (20–200 Hz) to modulate pressure
  • Supply voltage at solenoid feed: battery voltage (nominal 11–14 V with engine running)
  • Note: exact values and PWM frequencies vary by manufacturer—always confirm factory specs

Diagnostic algorithm

  1. Use a scan tool to confirm P0998, review freeze-frame and any additional transmission codes.
  2. Visually inspect the solenoid harness and connector for corrosion, pin damage, or loose fit; repair as needed.
  3. With ignition off, disconnect solenoid connector and measure coil resistance across solenoid terminals; compare to spec. Replace solenoid if out of range or open.
  4. Reconnect and back-probe the control wire. With ignition on (engine off) and with engine running if safe, command solenoid ON/OFF using scan tool. Observe voltage at the control pin and behavior (should switch between near battery voltage and ground or show PWM).
  5. If control signal is absent or stuck low, check continuity from the solenoid connector to the TCM/PCM pin. Repair any open or damaged wiring.
  6. Check for short to ground or short to battery on the control circuit using an ohmmeter and isolated testing. Repair wiring faults.
  7. Verify supply fuse/relay feeding solenoid circuit is good and providing battery voltage to the feed side of the solenoid.
  8. If wiring and solenoid test good but driver output at the module is abnormal, suspect TCM/PCM driver failure—consult manufacturer guidance for module testing/programming; consider module replacement only after verifying external wiring and components.
  9. After repairs, clear codes and perform a road test and live-data verification to confirm proper shift solenoid operation and that P0998 does not return.
  10. If intermittent, inspect for chafing where harness contacts chassis or exhaust heat areas and secure/replace harness as required.

Likely causes

  • Broken wire or poor crimp at connector for Shift Solenoid F
  • Corrosion or water intrusion in the solenoid connector
  • Open solenoid coil (infinite or very high resistance)
  • Shorted solenoid control wire to ground (pulling voltage low)
  • Failed driver inside TCM/PCM that cannot source/sink correctly

Fault status

⚠️ Status
Shift Solenoid F Control Circuit Low — low voltage detected on the solenoid control circuit (possible open, short to ground, bad connector, failed solenoid or driver).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

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P0750 P0755 P0760 P0770 P0775 P0996
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