P0918 - Transmission Range Sensor Circuit High Input - Common in 2015-2018 Ford Focus and Honda Civic

Quick Answer

P0918 means: P0918 indicates a high input signal from the transmission range sensor, affecting the automatic transmission's operation.

Fix: Check and replace faulty components Cost: $150 - $300 Time: 90-180 minutes

Can I drive with P0918? Address immediately to prevent further transmission damage.

Common Questions

What does P0918 mean and how does it affect my car?

P0918 indicates a problem with the transmission range sensor, which relays gear position to the transmission control module. If this sensor sends incorrect signals, your vehicle might experience delayed shifts, erratic gear changes, and could even stall. Over time, neglecting this code can lead to severe transmission damage, which is costly to repair.

What are the most common causes of P0918 and how much does it cost to fix?

The most common cause of P0918 is a faulty transmission range sensor, which typically costs between $150 and $300 to replace. Other causes include damaged wiring, which can range from $100 to $200, and TCM software issues, which may cost around $50 to $100 to resolve. Diagnostic fees may also apply.

Can I drive my car with P0918 or should I stop immediately?

It's advisable to address the P0918 code promptly as it can lead to transmission problems. While you may still drive the vehicle, expect performance issues like hard shifting or potential stalling. Ignoring it can cause more severe damage, resulting in higher repair costs.

How can I diagnose P0918 myself using GeekOBD APP?

To diagnose P0918 with the GeekOBD APP, connect the app to your vehicle’s OBD2 port. Use it to scan for diagnostic trouble codes and view freeze frame data for context. Check the voltage readings from the transmission range sensor against the manufacturer’s specifications. If readings are out of range, further investigation is needed.

What vehicles are most commonly affected by P0918?

P0918 is frequently encountered in vehicles such as the 2015-2018 Ford Focus, Honda Civic, and various models from Chevrolet and Nissan. If you own any of these vehicles, be aware of this code and its implications for your transmission system.

How can I prevent P0918 from happening again?

To prevent P0918, ensure regular maintenance of your vehicle's transmission system, including fluid changes and inspections of electrical connections. Avoid harsh driving conditions that could strain the transmission and consider periodic software updates for the TCM through your dealership.

What is P0918?

The diagnostic trouble code P0918 indicates a problem with the transmission range sensor, specifically that there is a high input signal detected in the circuit. This sensor is crucial for the proper functioning of the vehicle’s automatic transmission, as it informs the transmission control module (TCM) about the position of the gear shifter. When the TCM receives an incorrect signal, it can lead to erratic transmission performance, such as harsh shifting or the inability to shift at all. This issue is commonly found in vehicles like the 2015-2018 Ford Focus and Honda Civic models. If left unaddressed, P0918 can cause significant wear on the transmission and may lead to complete transmission failure over time. Drivers may notice unusual behavior such as delayed shifting or a check engine light illuminating on the dashboard. Regular maintenance and prompt attention to warning codes are essential to avoid extensive repairs and ensure the longevity of your vehicle’s transmission system.

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

Symptoms

Common symptoms when P0918 is present:

  • Check engine light stays on constantly, indicating an issue that requires attention.
  • Engine hesitates during acceleration, leading to a frustrating driving experience.
  • Fuel economy decreased by 10-15%, which can impact your budget over time.
  • Delayed or harsh shifting between gears, which can be a sign of serious transmission problems.
  • Unresponsive transmission, where the vehicle may not shift into gear at all, posing safety risks.

Possible Causes

Most common causes of P0918 (ordered by frequency):

  1. The most common cause of P0918 is a faulty transmission range sensor, occurring in approximately 60% of cases. This sensor can wear out or fail due to exposure to heat and vibration over time.
  2. Another common cause is damaged wiring or poor connections in the sensor circuit, which can lead to incorrect voltage readings. This issue may arise from corrosion or physical damage to the wiring harness.
  3. The third cause could be an issue with the transmission control module (TCM), where software glitches or failures in the module can lead to inaccurate readings from the sensor. Regular software updates can help prevent this.
  4. Less common but serious causes include internal transmission issues such as worn gears or clutches, which can be much more expensive to repair.
  5. A rare but possible cause is a failed powertrain control module (PCM), which can lead to a miscommunication between the TCM and other vehicle systems, requiring specialized diagnostics.

P0918 Repair Costs

Cost Breakdown by Repair Type

Transmission Range Sensor Replacement

Replacing the faulty transmission range sensor to restore proper function.

  • Total: $150 - $300
  • Success rate: 85%
Wiring Repair

Repairing or replacing damaged wiring or connectors in the sensor circuit.

  • Total: $100 - $200
  • Success rate: 75%
TCM Software Update

Updating the transmission control module software to fix possible glitches.

  • Total: $50 - $100
  • Success rate: 70%
Money-Saving Tips for P0918
  • 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 P0918 Diagnosis Process

Follow these systematic steps to accurately diagnose P0918. 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 to check the voltage of the transmission range sensor and ensure it meets specifications (20-30 minutes)

Step 3: Component testing - Use a multimeter to check the voltage of the transmission range sensor and ensure it meets specifications (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 using the GeekOBD APP (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (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 the repair success and ensure proper shifting (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm the repair success and ensure proper shifting (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 in a 2017 Ford Focus

Vehicle: 2017 Ford Focus, 45,000 miles

Problem: Customer reported the check engine light illuminated with hard shifting.

Diagnosis: Using the GeekOBD APP, a P0918 code was retrieved. Voltage readings from the transmission range sensor were outside manufacturer specifications.

Solution: Replaced the faulty transmission range sensor and cleared the codes.

Cost: $250 (including parts and labor)

Result: Post-repair road test confirmed smooth shifting and check engine light remained off.

Case Study 2: Wiring Repair in a 2016 Honda Civic

Vehicle: 2016 Honda Civic, 60,000 miles

Problem: Owner noticed engine hesitation and check engine light coming on intermittently.

Diagnosis: OBD2 scan revealed P0918. A visual inspection found damaged wiring in the transmission range sensor circuit.

Solution: Repaired the damaged wiring and reconnected the sensor.

Cost: $150 (parts and labor)

Result: Vehicle performed normally afterward, with no further issues reported.

Diagnose P0918

Use GeekOBD APP for professional diagnosis!

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  • Professional-grade analysis
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Code Information

Code: P0918
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes