C0847 - Understanding the Code and Its Impact on 2015-2018 Chevrolet Silverado and Other Vehicles

Quick Answer

C0847 means: C0847 indicates a problem with the brake pedal position sensor circuit.

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

Can I drive with C0847? Immediate attention is recommended to ensure safe braking functionality.

Common Questions

What does C0847 mean and how does it affect my car?

C0847 indicates a fault in the brake pedal position sensor circuit, which can severely impact braking performance, leading to potential safety risks.

What are the most common causes of C0847 and how much does it cost to fix?

The most common cause is a faulty brake pedal position sensor, with repair costs ranging from $150 to $300, depending on parts and labor.

Can I drive my car with C0847 or should I stop immediately?

It is highly advised to refrain from driving your vehicle with this code, as it could lead to unsafe braking conditions.

How can I diagnose C0847 myself using GeekOBD APP?

Use the GeekOBD APP to scan for codes and monitor the brake pedal position sensor's readings while pressing the brake pedal to check for inconsistencies.

What vehicles are most commonly affected by C0847?

Commonly found in vehicles like the 2015-2018 Chevrolet Silverado, GMC Sierra, and some models of Cadillac Escalade.

How can I prevent C0847 from happening again?

Regular maintenance checks of the braking system and ensuring connections are clean can help prevent future occurrences of C0847.

What is C0847?

The DTC code C0847 signifies a malfunction within the vehicle's Active Brake Control System, specifically related to the brake pedal position sensor circuit. This code typically arises when the Powertrain Control Module (PCM) detects an inconsistency in the sensor readings, which can lead to improper brake functionality. For vehicle owners, this could mean experiencing issues like unexpected braking behavior or even a failure of the brake warning light to illuminate when necessary. The brake pedal position sensor is crucial as it informs the vehicle’s braking system about the position of the brake pedal, which is essential for safe operation. In a worst-case scenario, ignoring this code might lead to decreased braking performance, potentially causing accidents or collisions. Therefore, understanding this code's implications and addressing it promptly is vital for maintaining vehicle safety and reliability.

System: C - Chassis (ABS, Steering, Suspension)

Symptoms

Common symptoms when C0847 is present:

  • The brake warning light may remain illuminated, indicating a fault in the braking system.
  • Drivers may feel that the brake pedal has a delayed response or inconsistent feel during operation.
  • Braking performance may be compromised, leading to longer stopping distances or unexpected braking behavior.
  • You may also notice unusual noises when pressing the brake pedal, which could indicate further issues.
  • In some cases, an OBD2 scanner may show multiple related codes, indicating broader system failures.

Possible Causes

Most common causes of C0847 (ordered by frequency):

  1. The most common cause of C0847 is a faulty brake pedal position sensor, which has a likelihood of 60%. This sensor can wear out over time, leading to incorrect readings.
  2. Another common cause is damaged wiring or connectors in the brake pedal position sensor circuit, which can lead to intermittent issues and are often overlooked during inspections.
  3. Contamination or corrosion at the sensor connections can also trigger this code; ensuring clean and secure connections can prevent this.
  4. Less commonly, a faulty PCM might misinterpret the data from the sensor, but this is rare and usually the last consideration.
  5. In rare instances, the brake system itself may have mechanical issues that cause sensor failures, leading to the C0847 code.

C0847 Repair Costs

Cost Breakdown by Repair Type

Brake Pedal Position Sensor Replacement

Replacing the faulty brake pedal position sensor to restore proper functionality.

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

Repairing damaged wiring or connectors that may lead to intermittent sensor failure.

  • Total: $50 - $150
  • Success rate: 75%
Money-Saving Tips for C0847
  • 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 C0847 Diagnosis Process

Follow these systematic steps to accurately diagnose C0847. 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 and resistance of the brake pedal position sensor (20-30 minutes)

Step 3: Component testing - Use a multimeter to check the voltage and resistance of the brake pedal position sensor (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 of the brake pedal position sensor and clear codes to see if they return (10-15 minutes)

Step 4: System function test - Verify proper operation of the brake pedal position sensor and clear codes to see if they return (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 success of repairs and ensure the brakes function correctly (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm the success of repairs and ensure the brakes function correctly (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: 2016 Chevrolet Silverado C0847 Repair

Vehicle: 2016 Chevrolet Silverado, 75,000 miles

Problem: Customer reported brake warning light was on and experienced delayed braking.

Diagnosis: Scanned for codes using GeekOBD APP; confirmed C0847. Inspected wiring and connections.

Solution: Replaced faulty brake pedal position sensor and repaired damaged wiring.

Cost: $250 (sensor - $200, labor - $50)

Result: Braking system functioned normally post-repair; warning light turned off.

Case Study 2: 2017 GMC Sierra C0847 Diagnostic Case

Vehicle: 2017 GMC Sierra, 50,000 miles

Problem: Brake pedal felt inconsistent and warning light was intermittently on.

Diagnosis: Used OBD2 scanner and inspected connections; identified a loose connector.

Solution: Reconnected wiring and replaced a corroded connector.

Cost: $100 (labor - $50, parts - $50)

Result: Resolved issue; customer reported normal brake performance thereafter.

Diagnose C0847

Use GeekOBD APP for professional diagnosis!

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  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: C0847
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes