P2147

Fuel Injector Group A Supply Voltage Circuit Low

Q: Is it safe to drive with P2147?

Not really — a low injector supply can drop out a whole group of cylinders, causing misfires, stalling, and possible converter damage. Repair it before extended driving.

Q: Can I just clear P2147?

It returns as soon as the low-voltage supply fault reappears; the wiring, ground, or control module needs to be fixed first.

Injector circuit Generic OBD-II High

What it means

P2147 means the PCM detects low supply voltage on the "A" group of fuel injectors. Without proper power those injectors can't fire correctly, so the affected cylinders may misfire, run rough, stall, or fail to fire at all. It usually points to a wiring, ground, or injector-control-module fault.

High

Can I keep driving? Fix promptly — if a group of injectors loses supply voltage the engine can misfire, run rough, stall, or fail to start on those cylinders.

Real-world scan data

Seen in

111

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Appears alongside · share of P2147 scans

P0201in 61.3% of scans

P0202in 60.4% of scans

P2150in 60.4% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Misfire, rough running, or noticeable loss of power
Hard starting or a no-start on the affected cylinder group
Stalling or hesitation

Common causes

Most likely first

Open or short-to-ground in the injector Group A supply (power) wiringLikely
Poor connector contact, corrosion, or a failed injector supply relay/fuseCommon
Faulty injector control module / driver (FICM)Common
Bad module groundLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data and check for companion injector codes (P2146, P2148).
Visually inspect the injector harness and connectors for damage, chafing, and corrosion.
Check the injector control module (FICM) supply voltage circuit and its fuse/relay for a low or missing feed.
Test the control module ground circuits against battery ground for excessive resistance.
If the supply and grounds are good, replace the injector control module as specified.

FAQ

Quick answers

Is it safe to drive with P2147?+

Not really — a low injector supply can drop out a whole group of cylinders, causing misfires, stalling, and possible converter damage. Repair it before extended driving.

Can I just clear P2147?+

It returns as soon as the low-voltage supply fault reappears; the wiring, ground, or control module needs to be fixed first.

Read & clear P2147 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX