P1516 — IMRC Input Error (Bank 1)

What Does P1516 Mean?

P1516 is a diagnostic trouble code indicating: IMRC Input Error (Bank 1). This code relates to the manufacturer-specific powertrain system. It has been reported in NHTSA complaints across 2 different vehicle models.

Symptoms of P1516

⚠️ Loss of engine power

Common Causes

🔍 Throttle body or throttle position sensor issue
🔍 Dirty or failed MAF sensor
🔍 Sensor or control module malfunction

P1516 Reports by Year

2020

1

2010

1

Real Owner Reports

From NHTSA complaint database — actual owner descriptions.

"CODES P1516, P2135, AND P0120 HAVE RETURNED FOR A THIRD TIME. I WAS DRIVING AND MY CAR WENT INTO REDUCED POWER MODE. LUCKILY, I WAS JUST A MILE AWAY FROM HOME AND LIMPED MY CAR HOME. I'VE SINCE CLEANED THE MASS AIR FLOW SENSOR AND THROTTLE BODY. I'VE CHANGED OUT THE TPS AND ACCELERATION SENSOR. I'VE"
— Gmc Yukon owner, 06/10/2020

"ON MAY 3RD 2010, THE TRUCK JUST DIED IN THE MIDDLE OF THE ROAD WHILE DRIVING HOME WITH MY SON AT NIGHT. I HAD TO QUICKLY TRY TO GET TO THE SIDE OF THE ROAD WITHOUT ANY POWER ASSIST. THE ENVOY WOULD NOT START AGAIN, NOT EVEN TURN OVER. THE SHIFTER WAS LOCKED AND IT COULD NOT EVEN BE PUT INTO NEUT"
— Gmc Envoy owner, 05/03/2010

Source: NHTSA Complaints Database

Most Reported Vehicles for P1516

Based on NHTSA owner complaint data.

#	Vehicle	Reports
1	GMC YUKON
2	GMC ENVOY

Frequently Asked Questions

Can I drive with this code?

It depends on the severity. If the vehicle runs normally, short trips are usually OK. If you notice performance issues, drivability problems, or warning lights beyond the check engine light, get it checked soon.

Will this code clear itself?

Some codes clear automatically after the underlying issue is fixed and several drive cycles pass. But the root cause must be addressed first.

How do I find the exact cause?

A code alone doesn't pinpoint the failed part. You need a diagnostic scan ($50-150 at most shops) that reads freeze frame data and live sensor readings to identify the specific component.

What To Do Next

Possible Fixes

🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
🔧 Test the relevant sensor(s) with a multimeter before replacing
🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P1516: IMRC Input Error (Bank 1)