P0988 - Understanding Common in 2015-2018 Ford F-150 and Other Models

Quick Answer

P0988 means: DTC P0988 indicates a high input signal from the Transmission Range Sensor 'B', affecting gear shifting.

Fix: Check and replace faulty components Cost: $150 - $400 Time: 90-180 minutes

Can I drive with P0988? Immediate attention is required to prevent transmission damage.

Common Questions

What does P0988 mean and how does it affect my car?

P0988 indicates a problem with the Transmission Range Sensor, which is critical for determining gear selection. If this code appears, it can lead to transmission issues such as erratic shifting or even the vehicle not starting, affecting overall performance and safety.

What are the most common causes of P0988 and how much does it cost to fix?

The most frequent cause of P0988 is a faulty Transmission Range Sensor, which can typically be replaced for $150 to $400. Other causes include damaged wiring or issues with the TCM, which may require additional repairs or reprogramming.

Can I drive my car with P0988 or should I stop immediately?

It's not recommended to drive your vehicle with a P0988 code. Doing so may lead to serious transmission damage and unsafe driving conditions. It’s best to seek immediate repair to avoid further issues.

How can I diagnose P0988 myself using GeekOBD APP?

To diagnose P0988 using the GeekOBD APP, start by connecting the app to your vehicle's OBD2 port. Run a diagnostic scan to retrieve any trouble codes, including P0988, and examine the freeze frame data to understand the conditions under which the fault occurred.

What vehicles are most commonly affected by P0988?

Models such as the 2015-2018 Ford F-150, 2016-2017 Ford Explorer, and 2017-2018 Chevrolet Silverado are frequently reported with P0988. Be sure to check for any recalls or technical service bulletins related to your specific model.

How can I prevent P0988 from happening again?

Regular maintenance, including checking the transmission fluid levels and inspecting wiring connections, can help prevent P0988. Additionally, keep software updates current and address any warning lights promptly to avoid potential issues.

What is P0988?

DTC P0988 is a diagnostic trouble code associated with the transmission control system, specifically indicating that the Transmission Range Sensor 'B' Circuit High Input has detected an issue. This sensor is crucial for determining the current gear selection and ensuring that the vehicle operates smoothly. When this code appears, it can lead to significant performance issues, such as erratic shifting, inability to start, or even complete transmission failure if left unaddressed. The Transmission Range Sensor is located on the transmission and monitors the position of the gear lever. If it sends a signal that is too high, it can confuse the vehicle's onboard computer, resulting in malfunctioning gear shifts. Common symptoms include the check engine light illuminating, unusual transmission behavior, and the vehicle entering limp mode, which restricts performance to prevent further damage. It's vital to address this code promptly, as neglecting it could lead to costly repairs or replacements later on.

System: P - Powertrain (Engine, Transmission, Emissions)

Symptoms

Common symptoms when P0988 is present:

  • The check engine light remains illuminated, indicating an issue that needs immediate attention.
  • You may experience rough or erratic shifting, where the transmission seems to hesitate or shift harshly between gears.
  • Fuel economy may drop significantly, potentially decreasing by about 10-15% due to improper gear selection.
  • The vehicle may enter limp mode, limiting acceleration and causing performance issues.
  • In some cases, you might notice that the vehicle won’t start at all, particularly in specific gear positions.

Possible Causes

Most common causes of P0988 (ordered by frequency):

  1. The most common cause of P0988 is a faulty Transmission Range Sensor, with a likelihood of about 60%. This sensor can wear out over time, leading to incorrect signal output.
  2. Another potential cause is damaged wiring or connectors in the sensor circuit. Corrosion or frayed wires can disrupt the signal transmission, leading to high input readings.
  3. Poorly adjusted or misaligned transmission components can also contribute to this code. Ensuring proper alignment can prevent this issue.
  4. Less common but serious causes include internal transmission failure or issues with the transmission control module (TCM), which can affect overall vehicle performance.
  5. A rare but possible cause is software glitches in the vehicle's computer system, which may require a software update or reprogramming.

P0988 Repair Costs

Cost Breakdown by Repair Type

Transmission Range Sensor Replacement

Replacing the faulty Transmission Range Sensor to restore proper functionality.

  • Total: $150 - $400
  • Success rate: 85%
Wiring Repair

Repairing damaged wiring or connectors in the sensor circuit.

  • Total: $100 - $250
  • Success rate: 75%
Transmission Control Module Reprogramming

Reprogramming or updating the TCM to resolve software issues.

  • Total: $100 - $300
  • Success rate: 70%
Money-Saving Tips for P0988
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional P0988 Diagnosis Process

Follow these systematic steps to accurately diagnose P0988. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the Transmission Range Sensor and wiring (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the Transmission Range Sensor and wiring (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes to see if the issue is resolved (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes to see if the issue is resolved (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and that the check engine light remains off (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and that the check engine light remains off (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: Transmission Range Sensor Replacement on 2017 Ford F-150

Vehicle: 2017 Ford F-150, 65,000 miles

Problem: Customer complained of erratic shifting and check engine light illumination.

Diagnosis: After scanning for codes, P0988 was retrieved, leading to a thorough inspection of the Transmission Range Sensor.

Solution: Replaced the faulty Transmission Range Sensor and cleared the codes. Conducted a road test to verify repairs.

Cost: $300 (sensor $200, labor $100)

Result: The issue was resolved, and the vehicle performed normally post-repair.

Case Study 2: Wiring Repair on 2016 Chevrolet Silverado

Vehicle: 2016 Chevrolet Silverado, 80,000 miles

Problem: Customer reported the vehicle entering limp mode and check engine light.

Diagnosis: Found damaged wiring in the Transmission Range Sensor circuit upon inspection.

Solution: Repaired the wiring harness and tested the sensor, ensuring proper functionality.

Cost: $180 (parts $80, labor $100)

Result: The vehicle returned to normal operation with no further codes present.

Diagnose P0988

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: P0988
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes