Auto Electric Repair in Chattanooga, TN

This is not a fast-turn general repair shop.

Clients come here for certainty, accountability and problem-solving.  That means slow work, validated results, and the kind of solutions that last.  Accurate electrical diagnosis protects your time, money, and vehicle from unnecessary parts replacement. 

Oil changes are expensive here—because we don’t like doing them and don’t want to attract clients looking for the cheapest option.   ➡️ See: Fluid & Maintenance

Providing advanced auto electrical repair and diagnostics for drivers throughout Chattanooga and surrounding communities.  

Located in Soddy-Daisy, TN, serving clients throughout the Chattanooga area. 

• Vehicle cranks but won’t start 
• Starts fine, then dies suddenly 
• Multiple warning lights on at once 
• Headlights flicker when using brakes 
• Power windows or locks stop intermittently 
• Dash lights dim while idling 
• Battery dies overnight with no reason 
• New alternator or battery, still not charging 
• Scan tools show 'No Communication' from modules

Yes, there’s advanced tooling on the bench.
But tools don’t fix cars—strategy does.
Every diagnostic session begins with a question, not a part.  Every answer comes with proof.

If you're tired of guesses, swaps, or “we couldn’t replicate it,” then you're in the right place.

Whether it’s a modern CAN bus issue or a classic car with no spark, electrical issues don’t scare us—they’re what we’re built for.

If you’re stuck or no one else will touch it, you’re probably in the right place.

When a shop says “you need a new computer” or “we can’t trace that short” that’s often the end of the road—for them.  For us, it’s where the work starts.  

From charging issues to no-start conditions, electrical diagnostics in Soddy-Daisy require more than a parts swap.  At Keeney Auto & Diesel, testing is performed at the module level using factory schematics and specialized tooling—because most electrical failures don’t just throw a simple code. 

Many general repair shops treat electrical issues as a guessing game.  We don’t.  Every test is controlled, verified, and repeatable.  Whether it’s a CAN bus fault, parasitic draw, or no-crank/no-start scenario, we trace the actual failure—no guesses, no unnecessary parts. 

Keeney Auto & Diesel specializes in diagnostics that go far beyond basic code scanning.  From multiplexed CAN and LIN networks to complex fault tracing on classic trucks, this is where unsolved problems get handled.

➡️ Link to: Specialty Diagnostics Page

Electrical failures can’t be guessed at—they’re proven through scope captures, voltage drops, impedance tests, and precise interpretation.

This isn’t just scan tool work.  This is logic-based troubleshooting with advanced tooling and experience behind every pin probe.

Whether the fault is buried in a harness, hidden inside a module, or caused by an aftermarket install, it gets documented and verified.

Older trucks with hacked wiring?
Classic cars converted from points ignition to modern ECUs?
Diesel work trucks with years of fleet repairs and no known diagram?

Yes—those too.

If it has wires, a computer, or a failure that no one else has time to trace, this shop is built for it.

➡️ Link to:

• Classic Car Repair 
• Light Duty Diesel Service 
• Performance & Aftermarket

Need a BCM, PCM, or ABS module replaced—but the dealer says parts are discontinued?
Other shops don’t have programming access?
Here’s what you should know:

• Programming is done in-house, including J2534 coding and custom flashing 
• BCMs and ECUs can be cloned or flashed offline using bench harnesses 
• Remote secure flashing is available using licensed passthrough sessions 
• EFILive is used for custom calibrations when OEM solutions don’t exist 
• One-off OEM software is used when no other option is on the market
   

This isn’t dealership-level—it’s beyond it.

➡️ Link to: ECU & Module Programming