Quick Answer

B0788 means: B0788 indicates a communication issue between the Transmission Control Module and the Transmission Range Sensor.

Can I drive with B0788? Immediate attention is recommended to avoid further transmission damage.

Common Questions

What is B0788?

The Diagnostic Trouble Code (DTC) B0788 indicates a malfunction related to the Transmission Control Module (TCM) within a vehicle's automatic transmission system. This code is specifically associated with an issue in the communication between the TCM and the Transmission Range Sensor, which is crucial for proper gear selection. When this code is triggered, it often leads to abnormal transmission behavior, such as erratic shifting or even complete inability to shift gears. In practical terms, if you're driving a vehicle that has this code, you may notice the 'Check Engine' light illuminated, and your vehicle may experience harsh shifting or be stuck in a single gear. For owners of affected models, such as the 2015-2018 Honda Accord, this code typically signifies a deeper issue that could involve wiring problems, poor connections, or even a faulty TCM itself. Addressing this code promptly is essential to prevent further damage to the transmission system and ensure your vehicle operates smoothly. Ignoring the B0788 code can lead to more expensive repairs down the line, as transmission issues can escalate quickly if not resolved.

Symptoms

Common symptoms when B0788 is present:

• The 'Check Engine' light stays on constantly, indicating a persistent issue with the transmission system.
• Harsh or erratic shifting occurs during acceleration, making the vehicle feel unstable or difficult to control.
• The vehicle may get stuck in one gear, limiting acceleration and overall performance, which can be especially dangerous in traffic.
• Increased fuel consumption, as the engine may work harder to compensate for shifting issues, potentially reducing fuel efficiency by 10-20%.
• Unusual noises from the transmission, such as grinding or whining, which can indicate severe internal problems.

Possible Causes

Most common causes of B0788 (ordered by frequency):

1. {'cause': 'Faulty or damaged wiring between the TCM and Transmission Range Sensor (60%) - This is the most common cause of the B0788 code and often involves frayed wires or poor connections that disrupt communication.', 'details': 'Inspect wires for wear and ensure all connectors are secure.'}
2. {'cause': 'Malfunctioning Transmission Range Sensor (25%) - This sensor helps the TCM determine which gear is selected. If it fails, it can send incorrect signals to the TCM.', 'details': 'Testing the sensor with a multimeter can confirm its operational status.'}
3. {'cause': 'Faulty Transmission Control Module (10%) - While less common, a failing TCM can trigger this code and usually requires replacement or reprogramming.', 'details': 'A specialized diagnostic tool may be needed to reprogram or replace the module.'}
4. {'cause': 'Software issues (3%) - Sometimes, outdated software in the TCM can cause communication errors, easily rectified with a software update.', 'details': 'Check with a dealer for any software updates for your vehicle model.'}
5. {'cause': 'Corrosion in connectors (2%) - Corrosion can disrupt electrical signals, leading to communication errors.', 'details': 'Cleaning connectors can often solve the issue.'}

B0788 Repair Costs

Diagnostic Steps

Real Repair Case Studies