Causes of P0247 engine code
From my time in the garage, the p0247 code nearly always boils down to one of these electrical issues:
- A broken wire in the circuit-most of the time, it’s the ground side-between the boost control solenoid B and the PCM.
- A split or open in the power feed going to the solenoid.
- A short to ground on the solenoid’s power supply wiring.
- A failed boost control solenoid B. Solenoids do die, but not as often as people think.
- Every once in a blue moon, it’s the PCM itself, but that’s truly rare in my experience.
I’ll let you in on a secret: out of all these, wiring and connector problems are by far the most common. Always start there before pointing fingers at the solenoid or PCM.
Symptoms of dtc P0247
If you’re behind the wheel and p0247 is active, here’s what you’ll usually pick up on:
- The check engine light stares you down and doesn’t go away.
- You might get a dashboard warning about engine or turbo trouble-depends on your model.
- The engine just feels lazy. You press the gas and it’s like the car’s lost its pep, especially when you need to accelerate hard.
Honestly, the sudden drop in power is the biggest red flag. It frustrates drivers and it’s a dead giveaway something’s up in the boost control circuit.
Diagnosis steps for obd code P0247
Here’s how I tackle a P0247, step by step-these are the same moves I use in the shop:
- First thing, check for any Technical Service Bulletins (TSBs) for your specific ride. Sometimes the fix is already mapped out by the manufacturer-definitely worth a look.
- Next, find boost control solenoid B. It’s usually hanging out near the turbo or along the intake piping. If you’re lost, grab a repair manual or check an engine bay diagram online.
- Then, give all wiring and connectors a close look. I’m searching for obvious culprits: frayed wires, melted plugs, greenish corrosion, or anything loose. Check both at the solenoid and back at the PCM.
- Unplug the connector and inspect the metal terminals inside. If they look dirty or corroded, hit them with some electrical contact cleaner and a tiny brush, let them dry, then add a dab of dielectric grease for good measure.
- Clear the code with a scan tool and see if it returns. If it stays gone, odds are it was just a bad connection causing all the trouble.
- If the code pops back up, time to test the solenoid itself. Unplug the harness and use a digital volt/ohm meter across the solenoid’s pins. Every car has its own resistance specs-if you get infinity (open) or zero (short), the solenoid's cooked and needs to go.
- If the solenoid reads good, check that there’s 12 volts at the power wire with the ignition on. No juice? Now you’re tracing wires back toward the PCM or relay, hunting for breaks or shorts.
- Check the ground side with a test light. Clamp onto battery positive, and touch the other end to the solenoid’s ground wire. Activate the solenoid with a scan tool. If the light doesn’t shine, the ground’s not doing its job.
- Here’s a pro trick: while testing, wiggle the harness. If the test light flickers, you’ve likely got a broken wire inside the insulation-one of those classic intermittent headaches.
- If everything checks out-wiring, solenoid, power, and ground-but the code still returns, only then do I start side-eyeing the PCM. But, honestly, that’s almost never the case. Replacing a PCM is a big job and requires reprogramming, so don’t go down that road unless you’re sure.
Having a friend to help is a huge plus-especially when you’re activating the solenoid or trying to catch those sneaky intermittent faults.
Common mistakes when troubleshooting P0247 code
I’ve watched plenty of folks chase their tails on this code, and here’s where they usually trip up:
- Swapping out the solenoid right off the bat, without even glancing at the wiring or connectors. Most of the time, the root cause is in the wiring, not the solenoid.
- Missing corrosion or loose pins inside the connectors-these little issues can drive you nuts if you overlook them.
- Skipping the TSB search. Sometimes the answer’s right there, but it gets missed because nobody checked.
- Blaming the PCM before exhausting all the basic checks. Trust me, bad PCMs are rare and expensive to replace on a hunch.
Don’t overcomplicate it. Nail the basics-solid visual and electrical checks will save you hours of frustration and a pile of cash.
Seriousness of P0247
This is one code you don’t want to brush off. With P0247 active, your turbo’s not playing by the rules, and you’ll notice a big drop in power. That’s not just annoying-it can be downright risky if you’re trying to merge onto a highway or pull out into traffic. Leave it unchecked, and you could end up with turbo damage, a hurt engine, or even a smoked catalytic converter from all the boost issues. Things can snowball fast, so get on top of it before you’re dealing with a much bigger repair bill.
Repair procedures for obd2 code P0247
Here’s what gets P0247 sorted in the real world, based on actual repairs and factory procedures:
- Fix or swap out any busted wiring or connectors between the boost control solenoid B and the PCM.
- Give all the electrical contacts and terminals a good cleaning and make sure they’re tight and protected.
- If the solenoid fails the resistance or activation tests, replace it with a good quality part.
- If, after all the above, you’ve proven the PCM is the problem (which is rare), then replace and reprogram it exactly as the manufacturer outlines.
- Clear the code and take the car for a test drive before calling the job done. Always double-check your work.
Start with the basics-wiring and connectors. Nine times out of ten, fixing those gets your turbo back in the game without expensive parts swaps.
Conclusion
Here’s the bottom line: P0247 means there’s an electrical snag in the boost control solenoid B circuit-most likely in the wiring or connectors, sometimes in the solenoid itself. Don’t ignore it. This issue can rob your engine of power and set you up for worse problems if you let it slide. The best fix? Start with a sharp-eyed inspection and some careful electrical testing, and only consider the PCM if you’ve ruled out everything else. Handle it sooner rather than later, and you’ll keep your engine healthy-and yourself out of trouble-down the road.
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