Powertrain, generic (extended)

P2B01 Cylinder 2 Injection Pulse Performance

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P2B01 is stored when the ECM keeps missing the opening signature of the cylinder 2 injector in normal running, i.e. it has no proof that fuel was delivered on that cylinder's commanded pulses. GM uses the code on direct-injection petrol engines. The 2019 table for the 2.7 L L3B judges 100 failures out of 380 samples; the 2025 tables reach a verdict sooner, after 50 to 100 samples. Both are Type B with the warning lamp on the second trip. GM's preliminary information PIT5677 to PIT5677E for 2019–2021 Silverado and Sierra 1500 with the L3B lists P2B01 next to P2B00 and P2B03 among dozens of codes that a grounded, chafed engine harness can trigger. A misfire count on cylinder 2 (P0302) helps tell an injector problem from a wiring one; P2B09 is the cold-start version.

Likely causes

Engine harness shorted to ground at a chafe point (GM L3B bulletin series PIT5677)

Cylinder 2 injector opening sluggishly or not at all (deposits, worn armature)

Corroded or loose injector 2 connector distorting the feedback voltage

Symptoms

Warning lamp after two trips
Uneven idle, possibly misfire on cylinder 2
Together with many other codes and erratic behaviour when the harness is shorted

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€50–900

Time0.3–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel injector cylinder 2injector wiringengine control module

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.